v0.8: Actionable health signals and selectors

[spytensor]

Context

The future overview should show only information that changes @host next action. This issue defines selectors and health signals so the console avoids noise.

Acceptance Criteria

• AC-1: Define selectors for work, role, gate, evidence, source, and GitHub state.
• AC-2: Implement or document work:active, work:blocked, work:failed-ci, work:stale-tracker, work:in-review, and work:closed.
• AC-3: Implement or document role:enabled, role:working, role:waiting-approval, role:resumed, and role:permission-risk.
• AC-4: Implement or document gate:active, gate:blocked, gate:missing-review, and gate:stale-plan.
• AC-5: Implement or document evidence:missing, evidence:incomplete, evidence:unverified, and evidence:tracker-stale.
• AC-6: Implement or document source:stale, source:missing, source:trust-changed, and source:visibility-denied.
• AC-7: Each health signal has severity, citation, and recommended next action.
• AC-8: Tests prove non-actionable informational metrics stay out of overview.

Evidence Required

• Selector/health model.
• Tests/fixtures.
• Validation commands.
• Risk and rollback.

Tracker Update Required

This issue is incomplete until tracker #238 is updated.

• Tick this issue checkbox in v0.8.0 - CoreRoom Console Data Plane Tracker #238.
• Update any satisfied milestone AC in v0.8.0 - CoreRoom Console Data Plane Tracker #238.
• Update the Evidence Ledger row in v0.8.0 - CoreRoom Console Data Plane Tracker #238.
• Mention the tracker update in PR body.

If implementation is complete but tracker is stale, report implementation complete, tracker incomplete.

Out Of Scope

• No arbitrary metrics dashboard.
• No hidden scoring model.
• No live TUI.