ci: probe protected split-lane activation

[ndizazzo]

Purpose

Temporary activation probe for the protected central-dispatch CI design landed in #1244 and the skipped-bootstrap correction in #1272.

The only change is behavior-neutral JSON whitespace in ci/slices.yml. Because that manifest belongs to ci-control, the ready-PR planner must fail open and dispatch all five independently readable workflow graphs.

Acceptance

• PR CI contains only routing.
• CI Control computes one canonical plan.
• Separate CI / Quality, CI / Website, CI / Linux, CI / macOS, and CI / Windows runs appear.
• Every lane is correlated by source SHA and plan digest.
• Aggregate CI Required completes successfully.
• PR-origin work remains GitHub-hosted with Depot placement and Depot remote-cache authority disabled.

Do not merge this temporary PR; close it after evidence is collected.

Summary by CodeRabbit

• Style
  • Improved formatting in the CI configuration file.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 4d1989e7-4e9c-4122-beab-9530c6736f33

📥 Commits

Reviewing files that changed from the base of the PR and between 99cd8ee and 50cc81a.

📒 Files selected for processing (1)

• ci/slices.yml

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📝 Walkthrough

Walkthrough

The change adds one blank line after the opening object in ci/slices.yml. No declarations or behavior change.

Changes

CI configuration formatting

Layer / File(s)	Summary
Format CI slices configuration ci/slices.yml	Adds an empty line immediately after the opening object.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Mergeability Score: ⚪ Minimal · up to 50cc8

This is a localized behavior-neutral manifest formatting change, so no actionable merge-blocking risk remains after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the CI activation probe, which matches the stated purpose of the pull request.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/ci-lane-activation-probe

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