Refresh agent instruction files

.claude/rules/workplan-convention.md

@@ -5,6 +5,12 @@ ID prefix: `IHP-WP`
 
 Work items originate as files in this repo **before** being registered in the hub.
 
+Canonical workplan/workstream frontmatter statuses are:
+`proposed`, `ready`, `active`, `blocked`, `backlog`, `finished`, `archived`.
+Use `proposed` for a newly drafted plan, `ready` after review against current
+repo state, and `finished` when implementation is complete. `stalled` and
+`needs_review` are derived health labels, not stored statuses.
+
 Closed workplans may be moved to `workplans/archived/` with a completion-date
 prefix: `YYMMDD-ihp-railiance-probe-WP-NNNN-<slug>.md`. The frontmatter id remains
 unchanged; the prefix is only for quick visual reference.