v0.8: Work, gate, evidence, and source projection models

[spytensor]

Context

The console must project existing CoreRoom facts into compact panels without losing evidence. WorkOrder rows must retain enough context for @host to decide the next action.

Acceptance Criteria

• AC-1: Add projection models for WorkOrder rows, gate pipeline, evidence closure, source health, and PR/CI status.
• AC-2: Work rows preserve phase, epic, issue, branch, PR, CI, evidence, tracker, lifecycle, and source citations.
• AC-3: Gate projection identifies current phase, blocked reason, missing review, stale plan SHA, and signoff readiness.
• AC-4: Evidence projection identifies complete, incomplete, missing, unverified items, rollback, and tracker update state.
• AC-5: Source projection identifies stale, missing, trust-changed, visibility-denied, and relevant WorkOrder/source relationships.
• AC-6: Tests cover healthy, blocked, failed CI, source drift, and merged-tracker-stale rows.

Evidence Required

• Projection models.
• Fixture(s).
• Tests.
• 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 live GitHub polling requirement.
• No UI rendering.
• No completion inference from prose.