feat(claude): emit channel declarations bound to plugin MCP servers (#187)

[ScriptedAlchemy]

Summary

• Slice 2 of the Track Claude Code plugin contract parity beyond the current adapter #187 systematic Claude parity pass (manifest completion).
• ClaudeHostConfig gains channels: declarations emitted into .claude-plugin/plugin.json, each bound to a plugin MCP server. Per-channel userConfig reuses the slice-1 planClaudeUserConfigOption contract (same identifier, collision, and sensitive-default rules).
• Plan-time validation with dotted diagnostics (claude.channels.declaration.invalid, .entry.invalid, .field.unknown, .server.required, .server.unknown, .userConfig.invalid, .key.invalid, .key.collision).
• Native proof against the installed Claude Code 2.1.257 found claude plugin validate --strict accepts a deliberately dangling server binding — the CLI never cross-checks .mcp.json keys, so claude.channels.server.unknown is the only pre-enable binding guard. Recorded honestly in capability evidence and PROVENANCE.
• Closed channel schema added to plugin.schema.json reusing the userConfigOption $defs; PROVENANCE notes record the tightenings (empty-array rejection, unknown-field rejection, duplicate-server declarations deliberately allowed).
• Claude adapter 1.10.0 → 1.11.0; unified plugin adapter 1.9.0 → 1.10.0 (channels row unavailable for the unified bundle per the lsp/bin precedent).

Test plan

• Scoped suites incl. native proofs (AGENT_BUNDLE_NATIVE_HOST_CONTRACTS=1, 0 skipped) post-rebase onto feat(claude): emit manifest metadata fields and pin component path rules (#187) #293
• pnpm typecheck
• pnpm lint

Part of #187 (slice 2).

[changeset-bot]

🦋 Changeset detected

Latest commit: cafa511

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
agent-bundle	Minor

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[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-02T06:54:42.596152Z	cafa511	PR opened

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[chatgpt-codex-connector]

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Reviewed commit: cafa511361

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[chatgpt-codex-connector]

Point channel option diagnostics at the channel

When an option inside channels[index].userConfig is malformed, this shared helper emits claude.userConfig.* messages and recoveries such as Set userConfig.bot_token.type..., which refers to the unrelated top-level field and omits the channel index. In configurations with top-level options or multiple channels, following the reported recovery does not repair the offending declaration and the build remains blocked; pass the channel path/context into the helper so these diagnostics identify channels[index].userConfig.<key>.

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[ScriptedAlchemy]

Fixed in 2530cc32. The shared option planner now accepts a path prefix, so channel diagnostics and recoveries identify channels[i].userConfig and emit indexed claude.channels[i].userConfig.* codes.