feat: Coordinator pre-spawn decision filtering

[diberry]

Problem

Every agent reads the ENTIRE decisions.md at spawn time (~86K tokens for this repo at 345KB). The lifecycle spawn API already accepts decisions?: string but nobody populates it. This is the single highest-ROI fix for the decisions bloat problem.

From

Flight, EECOM, Procedures reviews of #20. Identified as highest-value architectural change.

Proposed

1. Add filterDecisionsForAgent(decisions, agentDomain) function in SDK
2. Coordinator reads decisions.md once at session start
3. Before each spawn, coordinator filters to only relevant decisions (by domain tag or recency)
4. Passes filtered string via existing decisions param on lifecycle API
5. Token consumption drops from ~86K to ~2K per spawn

Dependencies

• Decisions need domain tags ([runtime], [testing], etc.) — see chore(scribe): Mandate ### YYYY-MM-DD: format in Scribe charter #24 (Scribe format)
• Or: simple recency filter (last 30 entries) as MVP

Impact

Reduces per-agent spawn context by ~95% without deleting any data.

Owner

EECOM (Core Dev) + Procedures (Prompt Engineer)

[github-actions]

🏗️ Squad Triage — Flight (Lead)

Issue: #27 — feat: Coordinator pre-spawn decision filtering
Assigned to: FIDO (Quality Owner)
Reason: Issue relates to testing/quality work

@copilot evaluation: No strong capability match — routed to squad member.

Team roster:

• Flight (Lead) → label: squad:flight
• Procedures (Prompt Engineer) → label: squad:procedures
• EECOM (Core Dev) → label: squad:eecom
• FIDO (Quality Owner) → label: squad:fido
• PAO (DevRel) → label: squad:pao
• CAPCOM (SDK Expert) → label: squad:capcom
• CONTROL (TypeScript Engineer) → label: squad:control
• Surgeon (Release Manager) → label: squad:surgeon
• Booster (CI/CD Engineer) → label: squad:booster
• GNC (Node.js Runtime) → label: squad:gnc
• Network (Distribution) → label: squad:network
• RETRO (Security) → label: squad:retro
• INCO (CLI UX & Visual Design) → label: squad:inco
• GUIDO (VS Code Extension) → label: squad:guido
• Telemetry (Aspire & Observability) → label: squad:telemetry
• VOX (REPL & Interactive Shell) → label: squad:vox
• DSKY (TUI Engineer) → label: squad:dsky
• Sims (E2E Test Engineer) → label: squad:sims
• Handbook (SDK Usability) → label: squad:handbook
• Ralph (Work Monitor) → label: squad:ralph
• @copilot (Coding Agent) → label: squad:copilot

To reassign, remove the current squad:* label and add the correct one.

[diberry]

Closing: work completed upstream or no longer relevant. See diberry/project-dina#22 cleanup audit.