docs: route CI runner policy from fleet entry point

[teamleaderleo]

Summary

• Link cmux CI runner policy to the hq Fleet and CI entry point.
• Put the minis-first, pinned-Xcode, and force-cancel/rerun invariants at the owner doc's top.
• Make cmux#15599 the only Blacksmith outage lever and link the hq lever log.
• Link cmux AGENTS/CLAUDE fleet guidance to the hq router.

Verification

• python3 tests/test_ci_cloud_overflow_switch.py
• python3 tests/test_ci_repo_variable_defaults.py
• python3 tests/test_ci_macos_xcode_selection.py
• ./tests/test_ci_self_hosted_guard.sh
• python3 scripts/verify-local.py --affected was interrupted by the existing time-sensitive feature-flags check after 60 seconds; no native code was selected.

— Rosehip g1 🐦 (run_worker_20260929_83c125e3)

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Summary by cubic

Routes the CI runner policy docs through the hq Fleet and CI entry point so fleet tasks start from one owner document.

• CLAUDE.md now points fleet tasks at the hq [Fleet and CI: start here] entry point instead of a generic reference.
• docs/ci-runners.md states the minis-first, pinned-Xcode, and force-cancel/rerun invariants at the top and marks the Blacksmith overflow switch as the only outage lever, linking the hq lever log.

^{Written for commit db3519e. Summary will update on new commits.}

[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[coderabbitai]

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Reviewing files that changed from the base of the PR and between ab564a4 and db3519e.

📒 Files selected for processing (2)

• CLAUDE.md
• docs/ci-runners.md

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[github-actions]

Merge receipt for db3519e30c, merged 2026-09-29 16:14:57 UTC

• Not verified at merge: CI fast guards (in progress)
• Verified: ci-status, Web complexity, web-validation, CI timing, Fast static checks, ios-e2e-status, route, Testbox broker trust boundary, tests
• Skipped by policy: backend, browser, Claude wrapper regressions, Dogfood build #​${{ github.event.pull_request.number }}, GhosttyKit release check, guards, ios-e2e, linux-preflight, mac-host, macos, macOS admission gate, remote-daemon, and 6 more
• Full suite: runs on main after merge.