[PR] fix(agent-guard): discover skill guards on a marketplace install [magpie]

["potiuk (via GitHub)" <gi...@apache.org>]

potiuk opened a new pull request, #1762:
URL: https://github.com/apache/magpie/pull/1762

   A marketplace caches every plugin on its own, as `<marketplace>/<plugin>/<version>/`, so the published `magpie-agent-guard` plugin has no framework tree above it and `framework_root()` returns `None` there.
   The skill-owned guards (`mention`, `mark_ready`, `security_language`) were therefore never discovered on a marketplace install — only the bundled `guards.d` ran.
   #1757 fixed discovery for checkouts and snapshots; this closes the remaining marketplace case, raised in its review.
   
   ## Summary
   
   - New `installed_plugin_guard_dirs()`: when the engine runs from `<marketplace>/magpie-agent-guard/<version>/` (no framework tree), scan `skills/*/guards` of the sibling family plugins in the same cache.
   - Version choice: each sibling's copy at the engine's own version (the families are released together), else its most recently installed version.
   - A framework checkout or snapshot is unaffected: `framework_root()` still wins, and `plugins/` in a checkout is never mistaken for a plugin cache.
   - Plugin copy of the engine synced, isolated-setup fingerprint regenerated, `tools/agent-guard/README.md` and the marketplace-distribution spec updated.
   
   ## Test plan
   
   - [x] Four new tests in `tools/agent-guard/tests/test_discovery.py` on a fake plugin cache: siblings discovered, own version preferred over a newer leftover, latest-install fallback, a checkout never scans a cache.
   - [x] Full `tools/agent-guard` suite passes.
   - [x] `prek` hooks pass on the changed files.
   
   ## Gen-AI disclosure
   
   Generated with Claude Code (Claude Opus 5); reviewed by the committer.
   
   🤖 Generated with [Claude Code](https://claude.com/claude-code)
   


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Re: [PR] fix(agent-guard): discover skill guards on a marketplace install [magpie]

["potiuk (via GitHub)" <gi...@apache.org>]

potiuk merged PR #1762:
URL: https://github.com/apache/magpie/pull/1762


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