storkit: create 436_refactor_unify_story_stuck_states_into_a_single_status_field

.storkit/work/1_backlog/436_refactor_unify_story_stuck_states_into_a_single_status_field.md

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+---
+name: "Unify story stuck states into a single status field"
+---
+
+# Refactor 436: Unify story stuck states into a single status field
+
+## Current State
+
+- TBD
+
+## Desired State
+
+Replace the separate blocked, merge_failure, and review_hold front matter fields with a single status field (e.g. status: blocked, status: merge_failure, status: review_hold). Simplifies the unblock command, auto-assign checks, and pipeline advance logic.
+
+## Acceptance Criteria
+
+- [ ] Replace blocked: true, merge_failure: string, and review_hold: true with a single status: field in story front matter
+- [ ] Auto-assign checks a single field instead of three separate ones
+- [ ] Pipeline advance and lifecycle code reads/writes the unified status field
+- [ ] Unblock command clears the status field regardless of which stuck state it was
+- [ ] retry_count remains a separate field (it's a counter, not a state)
+- [ ] Migration: existing stories with old fields are handled gracefully on read
+
+## Out of Scope
+
+- TBD