chore: update standalone state hub wiring

scripts/project_rules/agents-codex.template

@@ -93,7 +93,7 @@ curl -s -X PATCH "http://127.0.0.1:8000/tasks/<task_id>" \
 1. Update workplan file task statuses to reflect progress
 2. Log: `POST /progress/` with a summary of what changed
 3. Note for the custodian operator: after workplan file changes, run from
-   `~/the-custodian/state-hub`:
+   `~/state-hub`:
    ```bash
    make fix-consistency REPO={REPO_SLUG}
    ```

scripts/project_rules/architecture.template

@@ -5,4 +5,4 @@
 
 ## Quick Reference
 
-`~/the-custodian/state-hub/mcp_server/TOOLS.md` — MCP tool reference
+`~/state-hub/mcp_server/TOOLS.md` — MCP tool reference

scripts/project_rules/repo-boundary.template

@@ -4,5 +4,5 @@ This repo owns **{PROJECT_NAME}** only. It does not own:
 
 <!-- TODO: List what belongs in adjacent repos, e.g.:
 - SSH key management → railiance-infra/
-- State hub code     → the-custodian/state-hub/
+- State hub code     → state-hub/
 -->

scripts/project_rules/session-protocol.template

@@ -12,7 +12,7 @@ Then call the MCP tool for richer cross-domain context (skip if unreachable):
 ```
 get_domain_summary("{DOMAIN}")
 ```
-If the hub is offline: `cd ~/the-custodian/state-hub && make api`
+If the hub is offline: `cd ~/state-hub && make api`
 
 **Step 2 — Check inbox**
 ```
@@ -51,12 +51,12 @@ add_progress_event(summary="...", topic_id="{TOPIC_ID}", workstream_id="<uuid>")
 If workplan files were modified, ensure the local copy is up to date first:
 ```bash
 git -C <repo_path> pull --ff-only
-cd ~/the-custodian/state-hub && make fix-consistency REPO={REPO_SLUG}
+cd ~/state-hub && make fix-consistency REPO={REPO_SLUG}
 ```
 For repos where implementation runs on a remote machine (e.g. CoulombCore),
 use the combined target which pulls before fixing:
 ```bash
-cd ~/the-custodian/state-hub && make fix-consistency-remote REPO={REPO_SLUG}
+cd ~/state-hub && make fix-consistency-remote REPO={REPO_SLUG}
 ```
 **C-15** (DB task ahead of file) is normal in multi-machine workflows — writeback
 will sync the file to match DB.  **C-16** (repo behind remote) blocks all writes