From 335a36a17d041949ad09e775aac6395cf5d9a9df Mon Sep 17 00:00:00 2001 From: Erik Shafer Date: Sat, 13 Jun 2026 16:47:58 -0500 Subject: [PATCH 1/3] =?UTF-8?q?fix:=20marten=209=20=E2=80=94=20session=20p?= =?UTF-8?q?rompt=20for=20partial-projection=20source-gen=20fix?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../fix-marten9-projection-source-gen.md | 74 +++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 docs/prompts/fix-marten9-projection-source-gen.md diff --git a/docs/prompts/fix-marten9-projection-source-gen.md b/docs/prompts/fix-marten9-projection-source-gen.md new file mode 100644 index 0000000..92c07a1 --- /dev/null +++ b/docs/prompts/fix-marten9-projection-source-gen.md @@ -0,0 +1,74 @@ +# Prompt — Fix: Marten 9 Conventional Projections Must Be `partial` for Source-Gen Dispatch + +| Field | Value | +|---|---| +| **Status** | Pending (sketched 2026-06-13; awaiting review before execution) | +| **Authored** | 2026-06-13 | +| **Target artifacts** | `src/CritterCab.Dispatch/RideRequesting/ActiveRideRequest.cs`, `src/CritterCab.Dispatch/RideRequesting/RequestTimeline.cs`, `src/CritterCab.Dispatch/FareQuoting/FareQuoteAttempts.cs`, `docs/retrospectives/fix-marten9-projection-source-gen.md` (new) | +| **Source-of-truth dependencies** | The CI failure on PR #31 / `main` run `27477344974`; the runtime `InvalidProjectionException` message; the JasperFx `marten-migration-v8-to-v9` ai-skill (runtime-codegen removal); the working test suite (`dotnet test CritterCab.slnx`) as the green/red oracle | +| **Workflow position** | Out-of-band CI-unblocking fix off `main`. First `fix:` PR in the repo. Lands **before** the Aspire PR (#31), which rebases onto the fixed `main` to go green. | + +--- + +## Framing — why this session exists + +The dependency bump in commit `2f83e66` moved the project to the 2026 Critter Stack line (Marten 9 / JasperFx 2.0). Marten 9 **removed runtime codegen** for conventional projections: `Apply` / `Create` / `ShouldDelete` methods are now dispatched by the compile-time `JasperFx.Events.SourceGenerator`, with **no runtime fallback**. The generator can only emit a dispatcher by augmenting a `partial` class. CritterCab's three conventional projection subclasses were not declared `partial`, so at host startup the projection graph throws `InvalidProjectionException: No source-generated dispatcher found for …`. This reds the entire test suite (7 of 8 fail at `DispatchTestFixture.InitializeAsync`). + +The breakage is pre-existing on `main` (its CI for `2f83e66` is `completed failure`); PR #31 (Aspire reconcile) was merely the first PR-triggered CI run to surface it. This fix is therefore scoped narrowly to un-red `main` — not the broader Marten 9 / Wolverine 6 migration audit, which remains its own follow-up. + +--- + +## Goal + +Declare the three conventional projection subclasses `partial` so the Marten 9 source generator emits their dispatchers, restoring a green `dotnet test CritterCab.slnx`. Author a retrospective. No opportunistic edits. + +--- + +## Spec delta + +**None.** A build/runtime fix to existing implementation code; no narrative or workshop is amended. Honest null delta. + +--- + +## Orientation files (read in order) + +1. **This prompt** and the CI failure log on PR #31. +2. **`src/CritterCab.Dispatch/RideRequesting/ActiveRideRequest.cs`** — `ActiveRequestsByRiderProjection : MultiStreamProjection`. +3. **`src/CritterCab.Dispatch/RideRequesting/RequestTimeline.cs`** — `RequestTimelineProjection : SingleStreamProjection`. +4. **`src/CritterCab.Dispatch/FareQuoting/FareQuoteAttempts.cs`** — `FareQuoteAttemptsProjection : SingleStreamProjection`. +5. JasperFx `marten-migration-v8-to-v9` ai-skill — the runtime-codegen-removal section. + +--- + +## Working pattern + +- **Branch off `main`, not off the Aspire branch.** This fix must land independently so `main` goes green; the Aspire PR rebases afterward. +- **Verify against the real test suite.** `dotnet test CritterCab.slnx` (Docker up for Testcontainers Postgres) is the oracle — red before, green after. A docs-only or build-only check is insufficient because the failure is a startup-time runtime exception, not a compile error. +- **Minimal change.** `partial` keyword only. `RideRequest` (self-aggregating `LiveStreamAggregation` target) does **not** need `partial` per the exception message — leave it untouched. +- **No opportunistic edits.** Other Marten 9 / Wolverine 6 breaking-change surfaces and the version doc-drift are out of scope (their own session). +- **Commit/push only on the user's say-so.** + +--- + +## Deliverable plan + +1. `ActiveRideRequest.cs` — `public class ActiveRequestsByRiderProjection` → `public partial class …`. +2. `RequestTimeline.cs` — `public class RequestTimelineProjection` → `public partial class …`. +3. `FareQuoteAttempts.cs` — `public class FareQuoteAttemptsProjection` → `public partial class …`. +4. Verify `dotnet test CritterCab.slnx` is green (8/8). +5. `docs/retrospectives/fix-marten9-projection-source-gen.md` — new retro. + +--- + +## Out of scope + +- **The rest of the Marten 9 / Wolverine 6 migration audit** (IRevisioned vs ILongVersioned, inline-lambda projection removal, ServiceLocationPolicy default flip, etc.) — its own session. This fix only addresses the one symptom redding CI. +- **Wolverine/Marten/Polecat version doc-drift** in README/CLAUDE/vision — deferred, as in the Aspire session. +- **Adding a direct `Marten` package reference or analyzer config** unless verification proves the source generator's analyzer asset does not flow transitively through `WolverineFx.Marten`. + +--- + +## Decisions to flag during the session + +1. **Does the source generator's analyzer asset flow transitively** (`WolverineFx.Marten` → `Marten`), or does CritterCab.Dispatch need a direct `Marten` reference / analyzer-asset include? If `partial` alone turns the suite green, the analyzer flows and no `.csproj` change is needed. +2. **Whether any further Marten 9 runtime failures surface** once the projection-registration error clears. If the suite reveals additional v9 breakage, capture it as a follow-up — do not expand this fix. From c44cf85981c5b53b8cfa176597f187aad459ee7b Mon Sep 17 00:00:00 2001 From: Erik Shafer Date: Sat, 13 Jun 2026 16:47:58 -0500 Subject: [PATCH 2/3] =?UTF-8?q?fix:=20marten=209=20=E2=80=94=20declare=20c?= =?UTF-8?q?onventional=20projections=20partial=20for=20source-gen=20dispat?= =?UTF-8?q?ch?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Marten 9 / JasperFx 2.0 removed runtime codegen for conventional projections; Apply/Create are now dispatched by the compile-time JasperFx.Events.SourceGenerator, which only augments partial classes (no runtime fallback). Declaring ActiveRequestsByRiderProjection, RequestTimelineProjection, and FareQuoteAttemptsProjection partial restores dispatcher generation. dotnet test CritterCab.slnx: 7/8 failing -> 8/8 green. The analyzer flows transitively via WolverineFx.Marten -> Marten; no csproj change needed. RideRequest (self-aggregating LiveStreamAggregation target) does not need partial and is untouched. --- src/CritterCab.Dispatch/FareQuoting/FareQuoteAttempts.cs | 2 +- src/CritterCab.Dispatch/RideRequesting/ActiveRideRequest.cs | 2 +- src/CritterCab.Dispatch/RideRequesting/RequestTimeline.cs | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/src/CritterCab.Dispatch/FareQuoting/FareQuoteAttempts.cs b/src/CritterCab.Dispatch/FareQuoting/FareQuoteAttempts.cs index f42ba5b..c7169cd 100644 --- a/src/CritterCab.Dispatch/FareQuoting/FareQuoteAttempts.cs +++ b/src/CritterCab.Dispatch/FareQuoting/FareQuoteAttempts.cs @@ -20,7 +20,7 @@ public class FareQuoteAttempts public enum FareQuoteOutcome { Pending, Quoted, Failed } -public class FareQuoteAttemptsProjection : SingleStreamProjection +public partial class FareQuoteAttemptsProjection : SingleStreamProjection { public FareQuoteAttempts Create(IEvent e) => new() { diff --git a/src/CritterCab.Dispatch/RideRequesting/ActiveRideRequest.cs b/src/CritterCab.Dispatch/RideRequesting/ActiveRideRequest.cs index e28775c..6963007 100644 --- a/src/CritterCab.Dispatch/RideRequesting/ActiveRideRequest.cs +++ b/src/CritterCab.Dispatch/RideRequesting/ActiveRideRequest.cs @@ -9,7 +9,7 @@ public class ActiveRideRequest public DateTimeOffset RequestedAt { get; set; } } -public class ActiveRequestsByRiderProjection : MultiStreamProjection +public partial class ActiveRequestsByRiderProjection : MultiStreamProjection { public ActiveRequestsByRiderProjection() { diff --git a/src/CritterCab.Dispatch/RideRequesting/RequestTimeline.cs b/src/CritterCab.Dispatch/RideRequesting/RequestTimeline.cs index e7dd7ed..a7991fe 100644 --- a/src/CritterCab.Dispatch/RideRequesting/RequestTimeline.cs +++ b/src/CritterCab.Dispatch/RideRequesting/RequestTimeline.cs @@ -12,7 +12,7 @@ public class RequestTimeline public sealed record TimelineEntry(string EventType, DateTimeOffset OccurredAt, string Summary); -public class RequestTimelineProjection : SingleStreamProjection +public partial class RequestTimelineProjection : SingleStreamProjection { public RequestTimeline Create(IEvent @event) => new() From b17de4944412b2f327bb523c42d7268d6a473f3f Mon Sep 17 00:00:00 2001 From: Erik Shafer Date: Sat, 13 Jun 2026 16:47:58 -0500 Subject: [PATCH 3/3] =?UTF-8?q?fix:=20marten=209=20=E2=80=94=20retro=20and?= =?UTF-8?q?=20index=20entries?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- docs/prompts/README.md | 1 + docs/retrospectives/README.md | 1 + .../fix-marten9-projection-source-gen.md | 79 +++++++++++++++++++ 3 files changed, 81 insertions(+) create mode 100644 docs/retrospectives/fix-marten9-projection-source-gen.md diff --git a/docs/prompts/README.md b/docs/prompts/README.md index 67b7b1d..2e13bbb 100644 --- a/docs/prompts/README.md +++ b/docs/prompts/README.md @@ -137,6 +137,7 @@ Subsequent sections are prompt-specific. Existing prompts in this directory serv - [`encode-spec-delta-closure-loop.md`](./encode-spec-delta-closure-loop.md) — Encoded the spec-delta closure-loop discipline as a permanent CritterCab convention across three README files. Adds new `### Spec delta cadence` subsection in this README defining the four-step closure loop (prompt → session → retro → spec document-history) and a paired format-conventions bullet pairing **Spec delta** with **Goal**; new `Spec delta — landed?` bullet in [`docs/retrospectives/README.md`](../retrospectives/README.md) format conventions; clarification paragraph in [`docs/narratives/README.md`](../narratives/README.md) on what `## Document History` entries should capture under the new discipline. Pattern borrowed from OpenSpec (not adopted as a framework). Refines [ADR-003 spec-anchored development](../decisions/003-spec-anchored-development.md), which committed to keeping specs current but did not name *how* per-session deltas are tracked. ADR-016 (spec-delta-as-closure-loop-discipline) deferred per session-start lean — trigger to revisit is 2–3 sessions exercising the discipline. Surfaced and dropped a stale narrative-backfill deliverable named in the May 15 handoff doc (narratives 001 and 002 already had populated Document History sections). Status: complete (2026-05-19). Produced retro at [`retrospectives/encode-spec-delta-closure-loop.md`](../retrospectives/encode-spec-delta-closure-loop.md). - [`housekeeping-delete-may-15-handoff.md`](./housekeeping-delete-may-15-handoff.md) — Housekeeping micro-PR following PRs #17 and #18. Deleted `docs/planning/2026-05-15-spec-delta-and-context-map-handoff.md` per the directory's "Disposable by design" lifecycle convention; both follow-up sessions the handoff doc queued (Session A and Session B) had shipped. **First prompt in CritterCab's history to include a `## Spec delta` section** — the convention's first forward exercise. Spec delta honestly named as "no canonical spec is amended" because the session is pure housekeeping; proves the convention can describe non-spec-amending sessions cleanly without forcing confabulation. Status: complete (2026-05-19). Produced retro at [`retrospectives/housekeeping-delete-may-15-handoff.md`](../retrospectives/housekeeping-delete-may-15-handoff.md). - [`skills-tidy-ai-skills-sync.md`](./skills-tidy-ai-skills-sync.md) — **First ai-skills upstream-sync session**; lighter-cadence successor to Phase 5's full reconciliation pass. Sync target is ai-skills @ `b0d0f7d` (HEAD as of 2026-05-22). Upstream delta since Phase 5 close (~2026-05-06) is 18 commits, of which only 4 touch skill content (HTTP idiomatic + style strengthening across three upstream HTTP skills; Marten projection `IncludeType()` scope clarification; first cut at migration skills for the latest Marten + Wolverine releases). The rest are infrastructure (sidebar reconciliation, Buy CTAs, install URL fixes, version bumps, the new `added_in` frontmatter convention upstream introduced). Introduces a **methodology shift**: Phase 5 used a per-skill audit lens (every Cab skill checked against its upstream counterpart); this session uses an upstream-commit-delta lens (only Cab skills whose upstream sources received content commits are inspected). Pre-prompt greps confirmed `wolverine-http-handlers/SKILL.md` does not currently contain the upstream-changed terminology (`sad path` / `happy path` / `InvokeAsync`) and `marten-projections/SKILL.md` does not currently mention `IncludeType` — so **zero content propagation to Cab skill files is a valid outcome** and the retro is the primary deliverable regardless. Records sync floor SHA `b0d0f7d` and the upstream-catalog inventory (75 skills, three new since Phase 5 close) so future syncs become a `git log ..HEAD` content-delta query. Closes out Phase 5's still-`In progress` retro as the natural conclusion of the reconciliation thread this session continues (explicitly named in metadata; not opportunistic). Second prompt in CritterCab's history to honestly name spec delta as null (first was [`housekeeping-delete-may-15-handoff.md`](./housekeeping-delete-may-15-handoff.md)). Three deferred decisions explicitly carved out: `added_in` adoption for Cab skills (separate methodology decision), `wolverine-grpc-handlers` / `wolverine-grpc-bidirectional-handlers` "ahead of ai-skills" disposition (stands until upstream `wolverine-grpc` skill publishes), and `Upstream` cross-references in Cab skills to the new upstream migration skills (no host paragraph exists). Status: complete (2026-05-23). Produced retro at [`retrospectives/skills-tidy-ai-skills-sync.md`](../retrospectives/skills-tidy-ai-skills-sync.md). Verified zero content propagation to both `wolverine-http-handlers/SKILL.md` and `marten-projections/SKILL.md` (re-greps + end-to-end reads confirmed no overlap); no Cab skill files modified. Phase 5 retro metadata close-out applied (`Status` In progress → Complete; `Outcome` synthesized from existing deliverable summary; new `## Document history` section). +- [`fix-marten9-projection-source-gen.md`](./fix-marten9-projection-source-gen.md) — **First `fix:` PR.** Out-of-band CI-unblocking fix off `main`: declared the three conventional projection subclasses (`ActiveRequestsByRiderProjection`, `RequestTimelineProjection`, `FareQuoteAttemptsProjection`) `partial` so Marten 9's compile-time `JasperFx.Events.SourceGenerator` emits their dispatchers (runtime codegen was removed in Marten 9 / JasperFx 2.0 with no fallback). Pre-existing `main` breakage from the `2f83e66` package bump, surfaced by PR #31's CI (`main` run `27477344974` was already failing). Three keywords; `dotnet test CritterCab.slnx` 7/8-failing → 8/8-green; the analyzer flows transitively through `WolverineFx.Marten` → `Marten` (no `.csproj` change). `RideRequest` self-aggregating type left untouched. Null spec-delta. Status: complete (2026-06-13). Produced retro at [`retrospectives/fix-marten9-projection-source-gen.md`](../retrospectives/fix-marten9-projection-source-gen.md). ### Workshops diff --git a/docs/retrospectives/README.md b/docs/retrospectives/README.md index 550f9ff..d8b5797 100644 --- a/docs/retrospectives/README.md +++ b/docs/retrospectives/README.md @@ -82,6 +82,7 @@ Subsequent sections are session-specific. Existing retros in this directory serv - [`encode-spec-delta-closure-loop.md`](./encode-spec-delta-closure-loop.md) — Session A of the two follow-up sessions queued by the 2026-05-15 spec-delta + context-map handoff. Encoded the spec-delta closure-loop discipline as a CritterCab convention across three READMEs: new `### Spec delta cadence` subsection in [`docs/prompts/README.md`](../prompts/README.md) defining the four-step closure loop (prompt → session → retro → spec document history); new `Spec delta — landed?` bullet in [`docs/retrospectives/README.md`](../retrospectives/README.md) format conventions; clarification paragraph in [`docs/narratives/README.md`](../narratives/README.md) on what `## Document History` entries should capture. Pattern borrowed from OpenSpec (not adopted as a framework). Refines [ADR-003 spec-anchored development](../decisions/003-spec-anchored-development.md) — names *how* per-session deltas are tracked, which ADR-003 committed to without specifying. ADR-016 deferred per session-start lean — trigger is 2–3 sessions exercising the discipline. **First retro in CritterCab's history to exercise the `Spec delta — landed?` line** (self-referentially, since the prompt predates the convention). Surfaced and dropped a stale narrative-backfill deliverable from the handoff doc. Triggered by [`prompts/encode-spec-delta-closure-loop.md`](../prompts/encode-spec-delta-closure-loop.md). Status: complete (2026-05-19). - [`housekeeping-delete-may-15-handoff.md`](./housekeeping-delete-may-15-handoff.md) — Housekeeping micro-PR following PRs #17 and #18. Deleted `docs/planning/2026-05-15-spec-delta-and-context-map-handoff.md` per the directory's "Disposable by design" lifecycle convention; both follow-up sessions the handoff doc queued had shipped. **First retro in CritterCab's history to forward-confirm against a prompt-named spec delta** (Session A's retro confirmed retroactively because its prompt predated the convention). The prompt named "no spec delta" honestly because the session is pure housekeeping; the named-none landed as the named-none. Validates the convention's edge-case handling for non-spec-amending sessions. Mid-session scope expanded to delink 14 broken cross-references across 7 historical-record files — new methodology precedent: do-not-edit-historical-records yields to factual correctness when a same-PR deletion creates dangling references in those records. Triggered by [`prompts/housekeeping-delete-may-15-handoff.md`](../prompts/housekeeping-delete-may-15-handoff.md). Status: complete (2026-05-19). - [`skills-tidy-ai-skills-sync.md`](./skills-tidy-ai-skills-sync.md) — **First ai-skills upstream-sync session**; lighter-cadence successor to Phase 5's full reconciliation. Sync target was ai-skills @ `b0d0f7d` (HEAD as of 2026-05-22). Eighteen-commit upstream delta categorized as 4 content commits (HTTP strengthen ×2, projections `IncludeType` clarification, migration-skills first cut) and 14 infrastructure / catalog-growth commits (sidebar reconciliation, Buy CTAs, install URL fixes, version bumps, new `added_in` frontmatter convention, three new upstream skills). Verified zero content propagation to both Cab counterparts (`wolverine-http-handlers/SKILL.md` and `marten-projections/SKILL.md`) via re-greps + end-to-end reads — upstream-changed surface lives in fundamentals layers Cab already cross-references rather than duplicates, so Phase 5's trim discipline carried the sync passively. **Closed out Phase 5 retro's metadata gap** (`Status: In progress` → `Complete`; `Outcome` synthesized from the existing `## Phase 5 deliverable summary`; new `## Document history` section) as natural continuation of the reconciliation thread. Introduces a **methodology shift** captured for future syncs: per-upstream-commit lens (this session) is correct for incremental syncs; per-skill audit (Phase 5) is correct for full reconciliations. Recorded sync floor SHA + upstream catalog inventory (75 skills, 7% growth) so the next sync becomes a `git log b0d0f7d..HEAD` content-delta query. **Second prompt-and-retro pair to exercise the spec-delta null-edge case** (first was `housekeeping-delete-may-15-handoff` on 2026-05-19). Triggered by [`prompts/skills-tidy-ai-skills-sync.md`](../prompts/skills-tidy-ai-skills-sync.md). Status: complete (2026-05-23). +- [`fix-marten9-projection-source-gen.md`](./fix-marten9-projection-source-gen.md) — **First `fix:` PR.** Declared the three conventional projection subclasses `partial` so Marten 9's source generator emits dispatchers (runtime codegen removed in v9 / JasperFx 2.0, no fallback); fixed pre-existing `main` breakage from the `2f83e66` bump that PR #31's CI surfaced. `dotnet test CritterCab.slnx` 7/8-failing → 8/8-green; analyzer flows transitively (no `.csproj` change); `RideRequest` self-aggregating type left untouched. Confirmed the diagnosis by checking `main`'s CI before assuming the PR caused it. Triggered by [`prompts/fix-marten9-projection-source-gen.md`](../prompts/fix-marten9-projection-source-gen.md). Status: complete (2026-06-13). Phase 1–3 retrospectives were not authored at the time those phases ran (the retrospective convention solidified during Phase 4). They may be reconstructed from the working transcripts and skill artifacts if needed; otherwise they remain a known gap in the project record. diff --git a/docs/retrospectives/fix-marten9-projection-source-gen.md b/docs/retrospectives/fix-marten9-projection-source-gen.md new file mode 100644 index 0000000..b16ef0d --- /dev/null +++ b/docs/retrospectives/fix-marten9-projection-source-gen.md @@ -0,0 +1,79 @@ +# Retrospective — Fix: Marten 9 Conventional Projections Must Be `partial` for Source-Gen Dispatch + +## Metadata + +- **Triggering prompt:** [`docs/prompts/fix-marten9-projection-source-gen.md`](../prompts/fix-marten9-projection-source-gen.md) +- **Status:** Complete +- **Date authored:** 2026-06-13 +- **Output artifacts:** + - `src/CritterCab.Dispatch/RideRequesting/ActiveRideRequest.cs` — `ActiveRequestsByRiderProjection` → `partial` + - `src/CritterCab.Dispatch/RideRequesting/RequestTimeline.cs` — `RequestTimelineProjection` → `partial` + - `src/CritterCab.Dispatch/FareQuoting/FareQuoteAttempts.cs` — `FareQuoteAttemptsProjection` → `partial` + - `docs/prompts/README.md`, `docs/retrospectives/README.md` — index entries +- **Outcome:** `dotnet test CritterCab.slnx` restored to 8/8 green. The Marten 9 source generator now emits dispatchers for the three conventional projection subclasses. Un-reds `main`; the Aspire PR (#31) rebases onto the fixed `main` to go green. + +--- + +## Framing + +The `2f83e66` bump to Marten 9 / JasperFx 2.0 removed runtime codegen for conventional projections — `Apply`/`Create` are now dispatched by the compile-time `JasperFx.Events.SourceGenerator`, which only augments `partial` classes. The three projection subclasses weren't `partial`, so every test died at host startup with `InvalidProjectionException: No source-generated dispatcher found …`. Pre-existing `main` breakage; surfaced by PR #31's CI. + +--- + +## Outcome summary + +| Projection | Base type | Change | +|---|---|---| +| `ActiveRequestsByRiderProjection` | `MultiStreamProjection` | `partial` | +| `RequestTimelineProjection` | `SingleStreamProjection` | `partial` | +| `FareQuoteAttemptsProjection` | `SingleStreamProjection` | `partial` | + +`RideRequest` (self-aggregating `LiveStreamAggregation` target) left untouched — self-aggregating types don't need `partial` per the exception message; confirmed still green. + +Three keywords. Suite: red (7/8 failing) → green (8/8). + +--- + +## What worked + +- **The runtime exception was a precise spec.** JasperFx's `InvalidProjectionException` named the exact remedy (`partial` for convention-method subclasses; self-aggregating types exempt; analyzer-asset check). Reading it carefully made this a three-keyword fix rather than a Copilot-suggested refactor to explicit projection types (which would have been unnecessary churn). +- **`dotnet test` as the oracle, with Docker up.** The failure is a startup-time runtime exception, not a compile error, so only running the suite proves the fix. Local Docker let it be verified green before the PR rather than guessing and waiting on CI. +- **Branching off `main`, not the Aspire branch.** Kept the fix independently mergeable so `main` goes green on its own; the Aspire PR rebases cleanly afterward. + +--- + +## What was harder than expected + +- **Nothing, once diagnosed — but the diagnosis required confirming ownership.** The failure appeared on the Aspire PR's CI, which initially looked like the Aspire change broke something. Checking `gh run list --branch main` (run `27477344974` = failure on `2f83e66`) proved it pre-existing. The lesson: when CI fails on a PR whose diff doesn't touch the failing area, check `main`'s CI before assuming the PR caused it. + +--- + +## Methodology refinements that emerged + +- **Decisions-to-flag answered:** + 1. **The source generator's analyzer asset flows transitively** through `WolverineFx.Marten` → `Marten` — `partial` alone turned the suite green with no `.csproj` change. Nothing is registered in `Program.cs`; the generator is compile-time automagic, gated only on `partial`. + 2. **No further Marten 9 runtime breakage surfaced** once the projection-registration error cleared — all 8 tests pass, so the remaining v9/v6 migration audit has no *known* additional CI-blocking symptom (but is still owed as a deliberate pass). +- **The `partial` requirement is the headline Marten 8→9 migration trap for this codebase.** Every BC that lands a conventional projection subclass will hit it. Worth a line in the eventual migration-notes / `marten-projections` skill so the next service author declares `partial` from the start. Captured here as a next-session input rather than edited opportunistically. + +--- + +## Outstanding items / next-session inputs + +- **Rebase the Aspire PR (#31)** onto the fixed `main` once this merges; expect a trivial index-file merge (both PRs append a bullet to the prompts/retros indices). +- **The deferred Marten 9 / Wolverine 6 migration audit** still stands as its own session (IRevisioned/ILongVersioned, inline-lambda projection removal, `ServiceLocationPolicy` flip, etc.) plus the version doc-drift — none currently red CI, so lower urgency than they were an hour ago. +- **Document the `partial` requirement** in the `marten-projections` skill (or eventual migration notes) so new projection subclasses get it from the start. +- The other five Aspire-session follow-ups (Grpc/Polecat 5.38-vs-6.8, ServiceDefaults, Swagger title, MessagePack NU1903, JasperFx feed 403) are unchanged. + +--- + +## Spec delta — landed? + +**Null delta, as named.** A code fix to existing implementation; no narrative or workshop amended. + +--- + +## Quantitative summary + +- **Files changed:** 3 (one keyword each) + 2 index READMEs. +- **Test suite:** 7/8 failing → 8/8 passing (`dotnet test CritterCab.slnx`, Debug, Docker-backed Testcontainers Postgres). +- **`.csproj` changes:** none (analyzer flows transitively — verified).