feat(watchsync): add rating state and the series media type

[Quick104]

Problem

Related issue: N/A
Validation tasks: none
Used by: Silo-Server/silo-server#1357 (server plugin adapter), Silo-Server/silo-plugins#10 (catalog SDK update), Silo-Server/silo-plugin-watchprovider-floppy#7 (Floppy ratings).

Watch-sync plugins had no way to import or export user ratings. There was also no media type for a series-level item, so series favorites, watchlist entries and ratings couldn't cross the plugin boundary.

Approach

Everything is appended; nothing is renumbered, and buf breaking against main reports nothing.

Where	Addition
WatchSyncMediaType	SERIES = 3: external_ids, title and year describe the series itself
WatchSyncOperation	SET_RATING = 10, REMOVE_RATING = 11
WatchSyncRemoteStateKind	RATING = 5
WatchSyncRemoteState	rating = 7, a WatchSyncRemoteRatingState {rating, rated_at, removed}
WatchSyncProviderDescriptor	import_ratings = 17, export_ratings = 18
WatchSyncEvent	rating = 15

The rating contract:

• Ratings are integers from 1 to 10; plugins convert their native scale by rounding half up and clamping.
• SET_RATING and REMOVE_RATING are desired-state writes, so resending must answer APPLIED or NO_CHANGE, including a removal of an absent rating.
• In a complete RATING snapshot, an absent title is unrated.

Validator. The ratings flags count as operations. When either is set, supported_media_types must include MOVIE or SERIES, and unknown future types still count.

Tolerant decoding. convert.DecodeCapability now ignores fields and enum values it doesn't know. A server node on an older SDK, in a mixed-version cluster sharing one database, then keeps loading capability metadata written by a newer one instead of dropping the plugin.

After merge this should be tagged v0.17.0 (additive, minor).

Validation

• Tests cover:
  • rating state and tombstone round-trips;
  • a SET_RATING event;
  • descriptor round-trips;
  • ratings-only, import-only and export-only descriptors;
  • rejection of ratings with only EPISODE;
  • acceptance of SERIES and unknown future types;
  • tolerant decoding of unknown fields and enum names.
• The compatibility guard tests still pass.
• go build, go vet and go test ./... pass.
• Generated code comes from protoc-gen-go v1.36.11 and protoc-gen-go-grpc v1.6.1, with unchanged headers.

Risks

Servers built on SDK v0.16.1 or earlier decode stored capability metadata strictly. They can't decode a descriptor that uses the new fields, and their plugin installer rejects such manifests. Plugin releases that use them must follow a server release built on this version.

Checklist

• I read and can explain the complete diff.
• This pull request addresses one concern.

AI Disclosure

• Harness: Claude Code (in T3 Code)
• Tool(s): Claude Code subagents
• Model(s): claude-opus-5-5
• Involvement: Fully AI-generated; the maintainer set scope and product decisions. Human review of the diff is pending.
• Adversarial review: An independent Claude Opus 5.5 subagent reviewed the SDK, adapter, and Floppy changes read-only. For this PR it found that strict capability decoding makes older-SDK server nodes drop a plugin whose stored descriptor uses new fields; DecodeCapability now ignores unknown fields and enum values. Field and enum numbering were confirmed additive.

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features
  • Watch-sync providers can now import and export ratings for movies and series, using whole-number ratings from 1 to 10.
  • Rating changes and removals can be synchronized, and complete rating updates can mark items without a rating as unrated.
  • Series are now supported as a watch-sync media type.
• Compatibility
  • Older nodes can load newer capability metadata while ignoring fields and values they don’t recognize.

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Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-24T01:08:27.908353Z	95b81a0	PR opened

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Review configuration:

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: a9fe8da2-46ef-4a6b-b569-1282a4070dc6

📥 Commits

Reviewing files that changed from the base of the PR and between 95b81a0 and 1391ca0.

📒 Files selected for processing (1)

• docs/compatibility.md

📝 Walkthrough

Walkthrough

The watch-sync protocol adds series media and rating import, export, and remote-state support. Capability decoding now discards unknown metadata. Manifest validation recognizes rating operations and checks supported media types.

Changes

Watch-sync ratings and series

Layer / File(s)	Summary
Series and rating protocol contracts proto/silo/plugin/v1/watch_sync_provider.proto, README.md, docs/compatibility.md, pkg/pluginproto/silo/plugin/v1/watch_sync_provider_test.go	The protocol adds SERIES media, rating operations, descriptor flags, and rating event and remote-state fields. Documentation describes rating values, rating state, and removal behavior. Round-trip tests cover rating events and states, including tombstones.
Capability metadata decoding pkg/pluginsdk/convert/convert.go, pkg/pluginsdk/convert/watch_sync_provider_test.go, docs/compatibility.md	DecodeCapability uses shared unmarshal options that discard unknown fields. Tests cover rating flags, SERIES media, and unknown watch-sync metadata.
Manifest rating validation pkg/pluginsdk/manifest/manifest.go, pkg/pluginsdk/manifest/watch_sync_provider_test.go	Rating import or export counts as a watch-sync operation. Validation requires a supported MOVIE or SERIES media type, while accepting unknown media types. Tests cover ratings-only manifests and supported media combinations.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Merge Risk: 🟡 Moderate · up to 95b81

Qualify the upgrade guidance before merging: older server nodes may fail to load capability metadata published by newer plugins.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 10.53% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 19 functions across 5 files. (3 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely identifies the two main changes: adding rating state and adding the SERIES media type.

Full details: Docstring Coverage

Explanation

Docstring coverage is 10.53% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 19 functions across 5 files. (3 skipped: 3 unsupported.)

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
In `@docs/compatibility.md`:
- Line 81: Revise the compatibility statement about convert.DecodeCapability to
limit unknown-field and enum tolerance to servers using the tolerant decoder
introduced for this path. State that nodes using the older decoder must be
upgraded before plugins publish capability metadata containing fields or enum
values those nodes do not recognize.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 34a13d40-f987-40a3-86a3-a0d3fc2cc57f

📥 Commits

Reviewing files that changed from the base of the PR and between 9bb04f1 and 95b81a0.

⛔ Files ignored due to path filters (1)

• pkg/pluginproto/silo/plugin/v1/watch_sync_provider.pb.go is excluded by !**/*.pb.go

📒 Files selected for processing (8)

• README.md
• docs/compatibility.md
• pkg/pluginproto/silo/plugin/v1/watch_sync_provider_test.go
• pkg/pluginsdk/convert/convert.go
• pkg/pluginsdk/convert/watch_sync_provider_test.go
• pkg/pluginsdk/manifest/manifest.go
• pkg/pluginsdk/manifest/watch_sync_provider_test.go
• proto/silo/plugin/v1/watch_sync_provider.proto

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