chore: sync .cursor from suite

.cursor/skills/autodev/SKILL.md

@@ -112,6 +112,15 @@ Do NOT modify, skip, or abbreviate any part of the sub-skill's workflow. The aut
 
 The state file (`_docs/_autodev_state.md`) is a minimal pointer — only the current step. See `state.md` for the authoritative template, field semantics, update rules, and worked examples. Do not restate the schema here — `state.md` is the single source of truth.
 
+**Conciseness rule (authoritative).** The state file MUST stay short. Acceptable content per field:
+
+- `name` — the step title from the active flow's Step Reference Table. That's it.
+- `sub_step.name` — kebab-case identifier from the active sub-skill. That's it.
+- `sub_step.detail` — **leave empty (`""`) by default.** Add a one-line note ONLY when the next-session resumer cannot infer where to pick up from `phase` + `name` + on-disk artifacts alone (e.g. `"batch 2 of 4"`, `"blocked on D-PROJ-2 reply"`, `"variant 1b"`). NEVER use `detail` as a changelog, recap, or summary of completed work — those facts belong in the relevant `_docs/` artifact (glossary, traceability matrix, leftovers folder, retro report, etc.) and in git history.
+- **Total file size target: <30 lines.** If you're tempted to write more, you're using the wrong artifact — write in `_docs/` instead.
+
+Multi-line `detail` blobs that recap what was just completed are a smell. The state file is a *pointer*, not a logbook.
+
 ## Trigger Conditions
 
 This skill activates when the user wants to: