Move host skill root resolution into the skills extension (#36943)

## What changed

- Move config-layer, user, system, plugin, extra, and repository skill-root
  resolution from `core-skills` into the host skills extension.
- Keep the core loader focused on loading explicit `SkillRoot` values.
- Relocate and expand tests for root precedence, deduplication, repository
  ancestry, plugin metadata, and concurrent probing.

GitOrigin-RevId: 3b95cf28101b8b4d64d54079d202154dad560aab
This commit is contained in:
felixxia-oai authored and copyberry committed 2026-08-04 18:41:55 +00:00
1 parent d1fb77d692
commit 1a7519fa07
13 files changed
+1077 -1109

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