fix(plugin): point manifest agents at .md files, not a directory

[CodeWithJuber]

What & why

Installing the plugin in Claude Code failed with:

Failed to install: Plugin … has an invalid manifest file at …/.claude-plugin/plugin.json.
Validation errors: agents: Invalid input

Root cause: the Claude Code plugin manifest schema requires each agents entry to be a path to a markdown agent file (pattern ^\./.*\.md$). The skills field may point at a directory, but agents may not. Our manifest had "agents": "./global/crew" (a directory), so schema validation rejected it. skills: "./global/tools" was accepted, which is why only agents was flagged.

Fix: list the four crew agents explicitly as ./global/crew/*.md file paths:

"agents": [
  "./global/crew/frontend-verifier.md",
  "./global/crew/independent-reviewer.md",
  "./global/crew/scout.md",
  "./global/crew/verifier.md"
]

The test/channels.test.js "plugin channel points at global/" test had pinned the invalid directory value (assert.equal(plugin.agents, "./global/crew")) — i.e. it was locking the bug in. Updated it to assert the array form, that every entry matches the schema's ./global/crew/*.md pattern, and that each referenced file exists on disk.

Checklist

• npm test passes — 439 pass / 0 fail / 2 skip
• npm run check passes (Biome) — clean on the touched JSON + test
• Conventional commit message (fix:)
• CHANGELOG.md updated under ## [Unreleased] — n/a, packaging bugfix; can fold into the next release notes
• No new runtime dependency
• npm run typecheck passes

Risk & rollback

• Risk level: low (manifest packaging + its test; no source/runtime change)
• Rollback plan: revert the commit
• Verified each agents path matches the schema regex ^\./.*\.md$ and resolves to a real file; skills (directory) is unchanged and still schema-valid.

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