diff --git a/.claude/skills/fullsend/SKILL.md b/.claude/skills/fullsend/SKILL.md
index 3933536..916b01d 100644
--- a/.claude/skills/fullsend/SKILL.md
+++ b/.claude/skills/fullsend/SKILL.md
@@ -24,12 +24,12 @@ For user-facing fullsend commands (trigger, inspect, watch, help), use the upstr
 
 ## Essential Principles
 
-1. **Customized files are full replacements.** When a repo places a file in `.fullsend/customized/harness/`, fullsend uses it *instead of* the scaffold version — not merged, not overlaid. Any field omitted from the customized file is silently dropped.
-2. **Upstream scaffold is source of truth.** The canonical harness and env definitions live in the scaffold repo. Customizations must track upstream changes or they drift.
-3. **Always diff before deploying.** Never commit a customized harness without comparing it field-by-field against the current upstream version.
+1. **`base:` composition, not `customized/` overlay.** ADR 0064 removed `.fullsend/customized/`. Repo-owned agents live under `.fullsend/rhdh/` and register in `.fullsend/config.yaml`. Harnesses inherit upstream via `base:` and override only the fields that differ.
+2. **`repos.yaml` is the fleet source of truth.** Version pins, mint URL, and the managed repo list live at the root of this repo. Roll a new fullsend version by bumping `github.fullsend_ref` and running `fullsend repos install -f repos.yaml` (PRs only, never `--direct`).
+3. **Always diff before deploying.** Thin `base:` harnesses still need a field-by-field check against the upstream file they inherit.
 4. **Docker ENV is dead at runtime.** OpenShell strips Containerfile `ENV` directives — they exist during `docker build` but not in the sandbox. All runtime env vars must go through `.env.d/` files.
-5. **Path flattening.** Fullsend overlays `.fullsend/customized/env/` → `env/`, `.fullsend/customized/harness/` → `harness/`, etc. Harness `host_files.src` paths are always relative to the **flattened** working dir (e.g., `env/foo.env`, never `customized/env/foo.env`).
-6. **Confirm before mutating.** Commands that write to GitHub (`comment`, `label`) must confirm with the user before acting. These are shared-state actions visible to the whole team.
+5. **Harness paths are relative to `.fullsend/`.** `host_files.src` values such as `rhdh/env/yarn-proxy.env` resolve from the per-repo `.fullsend/` root, not from a flattened `customized/` overlay.
+6. **Confirm before mutating.** Commands that write to GitHub (`comment`, `label`) must confirm with the user before acting. These are shared-state actions visible to the whole team. Scaffold upgrades go through PRs.
 
 </essential_principles>
 
@@ -91,7 +91,7 @@ To add a variable, create an env file and wire it via `host_files` in the harnes
 | `debug <#issue> [--repo]` | Run sandbox diagnostics (shortcut for `trigger debug`) |
 | `comment <#issue> <message> [--repo]` | Post a comment on an issue or PR |
 | `label <#issue> <add\|remove> <label> [--repo]` | Add or remove a label on an issue or PR |
-| `upgrade [version]` | Upgrade CLI, scaffold files, and dispatch workflows to a new fullsend release |
+| `upgrade [version]` | Upgrade CLI, bump `repos.yaml`, and converge target repos via PRs |
 | `custom-agents` | Guide for building custom standalone agents (scaffold, dispatch, security) |
 | `local-setup` | Guide for running fullsend agents locally on a Mac |
 
@@ -215,7 +215,7 @@ agent-<agent>-<issue>-<timestamp>/
 
 ## Sandbox Image
 
-The custom image (`ghcr.io/redhat-developer/rhdh-fullsend-code:latest`) is built from `images/code/Containerfile` in rhdh-fullsend. Auto-builds on push to main when `images/code/**` changes.
+The custom image (`ghcr.io/redhat-developer/rhdh-fullsend-code:latest`) is built from `images/code/Containerfile` in rhdh-fullsend. Auto-builds on push to `main` when `images/code/**` or `repos.yaml` changes (a `fullsend_ref` bump rebuilds so `:latest` picks up the new upstream `fullsend-code` base). `workflow_dispatch` remains for an out-of-band rebuild.
 
 ### What's in it (on top of upstream fullsend-code)
 
diff --git a/.claude/skills/fullsend/references/upgrade.md b/.claude/skills/fullsend/references/upgrade.md
index e6fd82e..556a36d 100644
--- a/.claude/skills/fullsend/references/upgrade.md
+++ b/.claude/skills/fullsend/references/upgrade.md
@@ -1,7 +1,7 @@
 # upgrade
 
-Upgrade customized scaffold files, dispatch workflows, and the CLI binary
-to a new fullsend release. Produces one PR per repo with all changes.
+Upgrade the fullsend CLI, then roll the scaffold workflow ref through
+`repos.yaml`. Every forge change lands as a PR — never `--direct`.
 
 ## Usage
 
@@ -9,41 +9,35 @@ to a new fullsend release. Produces one PR per repo with all changes.
 /fullsend upgrade [target-version]
 ```
 
-- `target-version`: e.g. `v0.18.0`. Default: latest release on fullsend-ai/fullsend.
+- `target-version`: e.g. `v0.37.0`. Default: latest release on fullsend-ai/fullsend.
 
 ## Prerequisites
 
 | Gate | Check | If fail |
 |------|-------|---------|
-| Scaffold dir | `$FULLSEND_SCAFFOLD_DIR` or `../asdlc-lab/resources/fullsend-ai/fullsend/` | Ask user to clone `asdlc-lab` |
+| `repos.yaml` | this repo's fleet manifest | Stop — the file is required |
 | `gh` CLI | `gh auth status` | Ask user to authenticate |
-| `fullsend` CLI | `fullsend --version` | Suggest downloading from GitHub releases |
+| `fullsend` CLI | `fullsend --version` | Download from GitHub releases |
+
+Official path: [Rolling out a new fullsend version](https://fullsend.sh/docs/guides/getting-started/repo-management#rolling-out-a-new-fullsend-version).
 
 ## Procedure
 
 ### 1. Determine versions
 
 ```bash
-# Current CLI version
 fullsend --version
-
-# Fetch latest tags from upstream
-cd <fullsend-repo> && git fetch --tags
-
-# Latest upstream release
 gh release list --repo fullsend-ai/fullsend --limit 3
-
-# Current version from our customized files (read forked-from stamp)
-head -5 <target-repo>/.fullsend/customized/harness/code.yaml
+grep fullsend_ref repos.yaml
 ```
 
-Show the user: current CLI version, current forked-from version (from stamps),
-and target version. Confirm before proceeding.
+Show the user: current CLI version, current `github.fullsend_ref`, and target
+version. Confirm before proceeding.
 
 ### 2. Upgrade CLI binary
 
 ```bash
-VERSION=<target>
+VERSION=<target>   # without the leading v, e.g. 0.37.0
 gh release download "v${VERSION}" --repo fullsend-ai/fullsend \
   --pattern "fullsend_${VERSION}_darwin_arm64.tar.gz" -D /tmp
 
@@ -55,127 +49,57 @@ chmod +x ~/.local/bin/fullsend
 fullsend --version
 ```
 
-### 3. Generate upstream changelog
-
-Diff the scaffold between the old and new versions to understand what changed:
-
-```bash
-OLD=v0.17.0  # from forked-from stamps
-NEW=v0.18.0  # target
-
-cd <fullsend-repo>
-git log --oneline $OLD..$NEW --no-merges | head -30
-
-# Scaffold-specific changes
-git diff $OLD..$NEW -- internal/scaffold/fullsend-repo/harness/
-git diff $OLD..$NEW -- internal/scaffold/fullsend-repo/agents/
-git diff $OLD..$NEW -- internal/scaffold/fullsend-repo/scripts/
-git diff $OLD..$NEW -- internal/scaffold/fullsend-repo/policies/
-git diff $OLD..$NEW -- internal/scaffold/fullsend-repo/templates/shim-per-repo.yaml
-```
+### 3. Bump the fleet manifest
 
-Present a summary of changes to the user. Classify each as:
-- **Must adopt**: path changes, new required fields, security fixes
-- **Should adopt**: new optional fields, improved defaults
-- **Informational**: script changes (inherited automatically if not customized)
+In `repos.yaml`, set `github.fullsend_ref` to the target tag (e.g. `v0.37.0`).
+Open a PR in **this** repo (`rhdh-fullsend`). Do not push to `main`.
 
-### 4. Per-repo upgrade
+Keep `github.mint_mode: private` and the self-hosted `mint_url`. Do not let
+setup/install fall through to `https://mint.fullsend.sh`.
 
-For each repo with `.fullsend/customized/`:
+### 4. Converge target repos (PRs only)
 
-#### 4a. Sync fork
+Dry-run first, then install **without** `--direct`:
 
 ```bash
-git fetch upstream
-git checkout main
-git merge upstream/main --ff-only
-git push origin main
+fullsend repos install -f repos.yaml --dry-run
+fullsend repos install -f repos.yaml redhat-developer/rhdh-agentic
 ```
 
-If ff-merge fails, the fork has diverged. Investigate before proceeding.
+Omit the repo filter to converge every entry in the manifest.
 
-#### 4b. Diff all customized files
+`repos install` on an already-installed repo:
 
-```bash
-UPSTREAM="<fullsend-repo>/internal/scaffold/fullsend-repo"
-OURS="<target-repo>/.fullsend/customized"
-
-for f in $(find "$OURS" -type f ! -name ".gitkeep" | sort); do
-  rel="${f#$OURS/}"
-  upstream_file="$UPSTREAM/$rel"
-  echo "--- $rel ---"
-  if [ -f "$upstream_file" ]; then
-    diff -u "$upstream_file" "$f" | head -40
-  else
-    echo "(custom — no upstream equivalent)"
-  fi
-done
-```
-
-For each file, record a decision:
-- **ADOPT**: apply upstream change to our customized file
-- **SKIP**: upstream changed but our customization is intentional — no action
-- **STAMP**: no changes needed — just update the version stamp
-
-Present the decision table to the user before making changes.
+- Refreshes `.github/workflows/fullsend.yaml` and thin callers (`prioritize.yml`)
+- Upgrades the `reusable-dispatch.yml` pin (`@<sha> # vX.Y.Z` stays SHA-pinned)
+- Reconciles mint URL / region variables from the manifest
+- **Does not rewrite** `.fullsend/config.yaml` (custom `agents:` stay)
+- **Does not delete** leftover `.fullsend/customized/` trees — remove those
+  in the same scaffold PR if they are empty `.gitkeep` placeholders (ADR 0064)
 
-#### 4c. Apply changes
+Review each scaffold PR before merge. Do not use `--direct`.
 
-Create a single branch per repo. Include ALL changes in one PR:
-- Scaffold file updates (harness, agents, policies)
-- Dispatch workflow sync (`.github/workflows/fullsend.yaml`)
-- Version stamp updates on every customized file
+### 5. Rebuild sandbox image if needed
 
-**Important constraints:**
-- Workflow files (`.github/workflows/`) need human push — the fs-code agent
-  token lacks `workflows` permission. Always include these in the manual PR.
-- Agent prompt `.md` files may reference harness paths (e.g.,
-  `/sandbox/workspace/prior-review.txt`). When harness `host_files[].dest`
-  paths change, grep agent prompts for the old paths.
-
-#### 4d. Update version stamps
-
-Every customized file gets updated stamps:
-```yaml
-# forked-from: fullsend v0.18.0 scaffold
-# last-synced: 2026-07-15
-```
+Check whether the upstream base image changed:
 
-For custom files with no upstream equivalent:
-```yaml
-# forked-from: custom (no upstream equivalent)
-# last-synced: 2026-07-15
-```
-
-### 5. Rebuild sandbox image
-
-Check if the upstream base image versions changed:
 ```bash
-git diff $OLD..$NEW -- images/code/Containerfile
-git diff $OLD..$NEW -- images/sandbox/Containerfile
+git -C /Users/mhild/src/fullsend-ai/fullsend diff $OLD..$NEW -- images/code/Containerfile
 ```
 
-Our Containerfile extends `ghcr.io/fullsend-ai/fullsend-code:latest`.
-Tool upgrades (Go, gopls, tirith) come from the base image automatically.
-
-Only change our Containerfile if:
-- The pinned yarn version changed in the target repo's `package.json`
-- We need to add/remove tools (e.g., openspec)
-
-To rebuild:
-```bash
-podman build -t rhdh-fullsend-code:local \
-  -f images/code/Containerfile images/code/
-```
+Our Containerfile extends `ghcr.io/fullsend-ai/fullsend-code:latest`. Tool
+upgrades come from the base image automatically. Only change our Containerfile
+if the pinned yarn version changed or we need to add/remove tools.
 
-CI auto-builds on push to main when `images/code/**` changes. If no
-Containerfile changes are needed, trigger manually via `workflow_dispatch`
-on the sandbox-images workflow to pick up the new base.
+CI auto-builds on push to `main` when `images/code/**` **or** `repos.yaml`
+changes. Bumping `github.fullsend_ref` is therefore enough to pick up the new
+upstream `fullsend-code` base — no Containerfile change and no manual
+`workflow_dispatch` required. Keep `workflow_dispatch` for an out-of-band
+rebuild (e.g. upstream published a new `:latest` without a ref bump).
 
 ### 6. Smoke test
 
-After PRs are merged, create a test issue on rhdh-agentic to verify
-the agent pipeline works with the upgraded scaffold and image.
+After the rhdh-agentic scaffold PR is merged, create a test issue:
 
 ```bash
 gh issue create --repo redhat-developer/rhdh-agentic \
@@ -185,37 +109,17 @@ Expected: triage agent picks up this issue, classifies it, posts status comment.
 Close this issue if triage succeeds."
 ```
 
-The `issues: opened` event auto-triggers triage. Watch the run:
-```bash
-/fullsend watch rhdh-agentic issue <N>
-```
-
-What to check:
-- Route job succeeds (dispatch workflow changes work)
-- Triage sandbox starts (image pulls correctly)
-- No credential or path errors in logs
-- Status comment posted on the issue
-
-If triage succeeds, close the issue:
-```bash
-gh issue close <N> --repo redhat-developer/rhdh-agentic \
-  --comment "Smoke test passed — triage ran successfully on <version>."
-```
-
-If it fails, inspect with `/fullsend inspect` and check the logs for
-path mismatches, credential delivery failures, or toolchain errors.
+Watch the run. If triage succeeds, close the issue.
 
 ## Known gotchas
 
-1. **Stale local checkout**: always `git fetch --tags` before diffing.
-2. **Silent path breakage**: mount path changes silently fail — files mount
-   but the agent can't find them at the old path.
-3. **Agent prompts reference harness paths**: grep `.md` files for old paths
-   when `host_files[].dest` changes.
-4. **Concurrency group cancellation**: `/fs-code` runs can be cancelled by
-   triage bot comments. Re-trigger after triage completes.
-5. **Agent skips branch creation**: for trivial changes, add explicit branch
-   instructions in the `/fs-code` comment.
-6. **Fork sync before branching**: stale forks cause phantom diffs in PRs.
-7. **Workflow files need `workflows` token scope**: the fs-code agent cannot
-   push `.github/workflows/` changes. Include in the manual PR.
+1. **Self-hosted mint.** Manifest `mint_mode` must stay `private` with the GCP
+   mint URL. `github setup` without `--mint-url` writes `mint.fullsend.sh`.
+2. **Config-targeting flags rewrite `config.yaml`.** `--runtime`, `--agents`,
+   `--mint-url`, `--inference-*` re-serialize the overlay (comments lost,
+   agents kept). Prefer `repos install` over `github setup` for upgrades.
+3. **Empty `customized/` dirs are leftover.** ADR 0064 removed the overlay;
+   custom agents live under `.fullsend/rhdh/` with `base:` composition.
+4. **Workflow files need `workflows` token scope.** The fs-code agent cannot
+   push `.github/workflows/` — that is why upgrades go through `repos install` PRs.
+5. **Do not `--direct`.** All scaffold and manifest changes land as PRs.
diff --git a/.claude/skills/fullsend/scripts/command-metadata.json b/.claude/skills/fullsend/scripts/command-metadata.json
index 7995cca..80ecc63 100644
--- a/.claude/skills/fullsend/scripts/command-metadata.json
+++ b/.claude/skills/fullsend/scripts/command-metadata.json
@@ -16,7 +16,7 @@
     "argumentHint": "<#issue> <add|remove> <label> [--repo owner/name]"
   },
   "upgrade": {
-    "description": "Upgrade CLI, scaffold files, and dispatch workflows to a new fullsend release.",
+    "description": "Upgrade CLI, bump repos.yaml, and converge target repos via PRs.",
     "argumentHint": "[version]"
   }
 }
diff --git a/.github/workflows/sandbox-images.yml b/.github/workflows/sandbox-images.yml
index 50fa681..d03a806 100644
--- a/.github/workflows/sandbox-images.yml
+++ b/.github/workflows/sandbox-images.yml
@@ -8,9 +8,13 @@ on:
       - main
     paths:
       - "images/code/**"
+      # Bumping github.fullsend_ref rebuilds so :latest picks up the new
+      # upstream fullsend-code base (FROM ghcr.io/fullsend-ai/fullsend-code:latest).
+      - "repos.yaml"
   pull_request:
     paths:
       - "images/code/**"
+      - "repos.yaml"
   workflow_dispatch:
 
 # Cancel in-progress runs for the same branch/PR.
diff --git a/README.md b/README.md
index f9e58d2..691d244 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@ skill for the RHDH team's agent infrastructure.
 
 | Component | Purpose |
 |-----------|---------|
+| **`repos.yaml`** | Fleet manifest for per-repo fullsend installs (version pin, mint, repo list) |
 | **Sandbox image** | Extends upstream `fullsend-code` with corepack + yarn for JS monorepos |
 | **Deployment docs** | GCP setup, repo onboarding, sandbox networking, known issues |
 | **`/fullsend` skill** | RHDH-specific Claude Code skill for validating configs, debugging sandboxes, and building custom agents |
@@ -22,6 +23,7 @@ New to fullsend? Start here:
 
 | Doc | What it covers |
 |-----|---------------|
+| [`repos.yaml`](repos.yaml) | Fleet manifest — bump `github.fullsend_ref` then `fullsend repos install -f repos.yaml`. Merging a pin bump also rebuilds `rhdh-fullsend-code`. |
 | [GCP Infrastructure](docs/gcp-infrastructure.md) | GCP project, WIF providers, IAM, service accounts |
 | [Sandbox Networking](docs/sandbox-networking.md) | DNS inside OpenShell sandboxes — why it fails, workarounds |
 
@@ -67,14 +69,14 @@ ghcr.io/fullsend-ai/fullsend-code:latest   (upstream)
 | `X.Y` | Tag push `v*` | Floating minor for auto-patch |
 | `<sha>` | Every non-PR build | Debugging and rollback |
 
-PRs build but don't push (validation only).
+PRs that touch `images/code/**` or `repos.yaml` build but don't push (validation only). Merging a `fullsend_ref` bump to `main` rebuilds and pushes `:latest`.
 
 ## Usage
 
 Reference in your fullsend harness config:
 
 ```yaml
-# .fullsend/customized/harness/code.yaml
+# .fullsend/rhdh/harness/code.yaml
 image: ghcr.io/redhat-developer/rhdh-fullsend-code:latest
 ```
 
diff --git a/repos.yaml b/repos.yaml
new file mode 100644
index 0000000..10cb493
--- /dev/null
+++ b/repos.yaml
@@ -0,0 +1,24 @@
+# Fleet manifest for RHDH fullsend per-repo installations.
+# https://fullsend.sh/docs/guides/getting-started/repo-management
+#
+# Roll out a new fullsend version (creates PRs, never pushes to default):
+#   1. Bump github.fullsend_ref below
+#   2. fullsend repos install -f repos.yaml
+#   3. Review and merge the scaffold PRs in each target repo
+#
+# Converge a single repo:
+#   fullsend repos install -f repos.yaml redhat-developer/rhdh-agentic
+version: 1
+defaults:
+  runtime: claude
+  allowed_remote_resources:
+    - https://raw.githubusercontent.com/fullsend-ai/fullsend/
+    - https://raw.githubusercontent.com/fullsend-ai/agents/
+github:
+  mint_mode: private
+  mint_url: https://fullsend-mint-gljhbkcloq-uc.a.run.app
+  fullsend_ref: v0.37.0
+  repos:
+    - name: redhat-developer/rhdh-agentic
+    - name: redhat-developer/rhdh-plugins
+    - name: redhat-developer/rhdh-plugin-export-overlays