docs: workplan-first agent guidance prose (CUST-WP-0055 T04 batch 3)

.claude/rules/architecture.md

@@ -20,7 +20,7 @@ code.
 ### External integrations
 
 - **Inter-Hub** (`https://hub.coulomb.social`) — hub rows, manifests, widgets, events
-- **State Hub** — workstream/task cache rebuilt from workplan files
+- **State Hub** — workplan/task cache rebuilt from workplan files
 - **OpenBao** — operator and runtime API key custody (`warden access --exec`)
 - **ops-warden** — SSH cert issuance and credential routing only
 

.claude/rules/repo-boundary.md

@@ -3,7 +3,7 @@
 This repo owns **ops-hub** only. It does not own:
 
 - Generic Inter-Hub framework, API substrate, auth → `inter-hub/`
-- State Hub workstream/task/decision implementation → `state-hub/`
+- State Hub workplan/task/decision implementation → `state-hub/`
 - SSH CA, credential routing catalog, bootstrap SSH envelope → `ops-warden/`
 - OpenBao mounts, platform secret paths, ESO → `railiance-platform/`
 - Cluster desired state, host principals, force-command wrappers → `railiance-infra/`

.claude/rules/workplan-convention.md

@@ -46,7 +46,7 @@ fix-consistency. Do not edit or rename it.
 
 **Workplan** is the fleet term — see
 `the-custodian/canon/standards/workplan-terminology-fleet_v0.1.md`.
-**Workstream** is legacy only: some API routes (`/workstreams/`), params
+**Workplan** is legacy only: some API routes (`/workstreams/`), params
 (`workstream_id`), MCP aliases (`create_workstream`), and the frontmatter field
 above remain until `STATE-WP-0069` retires them via legacy-meter. Treat those
 identifiers as workplan IDs. Prefer `GET /workplans/` and `workplan_id` in new