Record sanitized host-selection observations without changing policy

[iammedved]

Proposal

Add `evals/fixtures/host-observations.json` for sanitized fresh-host selection results. This is not the deterministic routing corpus and does not change SKILL.md or the router.

Recorded:

• Grok CLI implicit EN investigation: selected Pinmind, route `investigation`, `routeBeforeTaskTools: false`.
• Four Codex CLI sessions after the README path `codex plugin marketplace add iammedved/Pinmind --ref v0.8.1`: plugin `0.8.1` at commit `5ee98ba`, both implicit and explicit RU/EN produced `investigation`. EN kept kernel before workspace tools; RU bundled a workspace search into the first command.

Safety checklist

• I removed secrets, credentials, personal data, private URLs, and local absolute paths.
• I included only files needed for this proposal.
• I ran the relevant validation commands.
• I understand that submission does not grant write or merge access and that the maintainer decides whether to apply the change.

Verification

• `node --test tests/kernel.test.mjs tests/release-verification.test.mjs` — 71/71 pass
• Local Codex marketplace `ref` is now `v0.8.1`; cache describe is `v0.8.1`; both plugin manifests are `0.8.1`