The state machine's `Stage` enum becomes the source of truth for pipeline
state. Six stages of work land together:
1. Clean wire vocabulary (`coding`, `merge`, `merge_failure`, ...) replaces
legacy directory-style strings (`2_current`, `4_merge`, ...) on the wire.
`Stage::from_dir` accepted both during deployment; new writes always
emit the clean form via `stage_dir_name`. Lexicographic `dir >= "5_done"`
checks in lifecycle.rs become typed `matches!` checks since the new
vocabulary doesn't sort in pipeline order.
2. `crdt_state::write_item` takes typed `&Stage`, serialising via
`stage_dir_name` at the CRDT boundary. `#[cfg(test)] write_item_str`
parses legacy strings for test fixtures.
3. `WorkItem::stage()` returns typed `crdt_state::Stage`; `stage_str()`
is gone from the public API. Projection dispatches on the typed enum.
4. `frozen` becomes an orthogonal CRDT register. `Stage::Frozen` and
`PipelineEvent::Freeze`/`Unfreeze` are removed; `transition_to_frozen`/
`unfrozen` set the flag directly without touching the stage register.
5. Watcher sweep and `tool_update_story`'s `blocked` setter route through
`apply_transition` so the typed transition table validates every
stage change. `update_story` gains a `frozen` field for symmetry.
6. One-shot startup migration rewrites pre-934 directory-style stage
registers (and sets `frozen=true` on items previously at `7_frozen`).
`Stage::from_dir` drops legacy aliases. The db boundary keeps a small
normaliser so callers with legacy strings (MCP, tests) still work.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Read-side migrations:
- agents/pool/auto_assign/backlog.rs: depends_on check now reads from
WorkItem.depends_on() instead of parse_front_matter.
- agents/pool/auto_assign/story_checks.rs: read_story_front_matter_agent
drops its YAML fallback — post-891 the CRDT entry is reliable, and
removing the fallback makes the contract honest. The now-unused
read_story_contents helper goes too.
- agents/pool/start/validation.rs: same shape — YAML fallback removed,
CRDT register is the only source for agent pinning.
- agents/pool/start/spawn.rs: epic-context injection wraps the
parse_front_matter call in `yaml_residue(...)` since `meta.epic` has no
CRDT analog (sub-story 933).
- agents/lifecycle.rs: item_type_from_id (numeric-only ID path) wraps its
parse_front_matter in `yaml_residue(...)` for the same reason (933).
The write-side `fields_to_clear_transform` calls in lifecycle.rs are
left for stage 8, when FS-shadow writes are deleted wholesale.
Test fix:
- start_agent_returns_error_when_front_matter_agent_busy now seeds the
CRDT entry (write_item with agent="coder-opus") instead of relying on
parse_front_matter reading the YAML on disk.
Filed earlier:
- 932 (review_hold register) — note: this turns out to be a real class-1
bug: write_review_hold_to_store still writes YAML but has_review_hold
reads Stage::Frozen, so the write goes into a void. 932 is the correct
fix.
All 2861 tests pass; fmt + clippy clean.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
dave
Timmy