feat(deploy): runbook/ledger templates + bridge schemas + gitignore transient state

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ho5EQCFTSvYamuRtVZpp2d

templates/deploy/INCIDENTS.md

@@ -0,0 +1,10 @@
+# Deploy incidents (append-only) — DEP-NNN
+
+<!-- One entry per incident. Next ID = grep '^## DEP-' | max+1. Mirrors blockers.md. -->
+<!-- ## DEP-NNN — <step> failed
+     - date: YYYY-MM-DD
+     - step: <runbook step + label>
+     - error: `<verbatim error>`
+     - cause: <root cause>
+     - fix: <what changed in PROCEDURE.md>
+     - resolved-by: <commit sha> -->