docs(ci-runners): minis first; never send a lane straight to Blacksmith

[teamleaderleo]

Adds the standing routing rule to docs/ci-runners.md, matching cmuxterm-hq#968: every lane tries the owned minis first, and dev-build priority comes from the controller's lend drain, not from flipping lane switches to 0.

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Summary by cubic

Documents the standing minis-first CI routing rule so lanes never go straight to Blacksmith, including what to do when dev builds are starved instead of flipping lane switches to 0.

^{Written for commit ac41bc1. Summary will update on new commits.}

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[github-actions]

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[github-actions]

Merge receipt for ac41bc1179, merged 2026-09-29 10:04:59 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.