feat: add codex dashboard telemetry

[da0101]

Summary

Adds Codex dashboard/session telemetry using the same data path the VS Code Agentboard dashboard already consumes for Claude sessions.

• Adds a Codex native hook bridge that normalizes Codex lifecycle, tool, and subagent events into Agentboard events.
• Adds a provider-neutral session snapshot writer for ~/.agentboard/sessions/*.json, agentboard.hud-status.json, and ~/.agentboard/live.json.
• Adds a codex-ab heartbeat fallback so Codex sessions still show in the dashboard when native project hooks are not active yet.
• Normalizes Codex file activity so dashboard code activity sees tool: Edit and file fields.
• Updates docs, templates, stream metadata, and focused unit coverage.

Validation

• node --check templates/platform/scripts/hooks/session-snapshot.js
• node --check templates/platform/scripts/hooks/codex-hook-bridge.js
• bash tests/unit.sh --filter codex_hook_bridge --verbose
• bash tests/unit.sh --filter event_logger --verbose
• bash tests/unit.sh --filter session_track --verbose
• bash tests/unit.sh --filter roles_pack --verbose
• cd extensions/vscode && npm run compile
• VS Code extension node tests: workspace root, nickname hash, parseEtime, linecount

Manual QA

Manual dogfood checklist added at .platform/work/qa/codex-dashboard-support-manual-qa.md. The next step after merge is installing/reloading the extension and starting Codex through .platform/scripts/codex-ab in a trusted project.

[github-actions]

agentboard stream status

Stream	Type	Status	Agent	Last updated
codex-dashboard-support	feature	awaiting-verification	codex	2026-06-26
code-cleanup-skill-role	feature	awaiting-verification	codex	2026-06-13
qa-self-heal-maestro	feature	awaiting-verification	codex	2026-06-14
Status	Meaning	Who sets it
---	---	---
planning	Scoping, not yet executing	Agent
in-progress	Actively working	Agent
blocked	Waiting on external input or decision	Agent or user
awaiting-verification	Work done, needs user confirm	Agent only

[github-actions]

agentboard stream status

Stream	Type	Status	Agent	Last updated
codex-dashboard-support	feature	awaiting-verification	codex	2026-06-26
code-cleanup-skill-role	feature	awaiting-verification	codex	2026-06-13
qa-self-heal-maestro	feature	awaiting-verification	codex	2026-06-14
Status	Meaning	Who sets it
---	---	---
planning	Scoping, not yet executing	Agent
in-progress	Actively working	Agent
blocked	Waiting on external input or decision	Agent or user
awaiting-verification	Work done, needs user confirm	Agent only