Regenerate agent instructions from state-hub templates (CUST-WP-0055 T01)

Sync AGENTS.md, CLAUDE.md, and .claude/rules from updated project_rules
templates: workplan-first session protocol, legacy terminology footnote,
and GET /workplans/ examples.

.claude/rules/first-session.md

@@ -0,0 +1,42 @@
+## First Session Protocol
+
+Triggered when `get_domain_summary("consumer")` shows **no workplans**.
+The project is registered but work has not yet been structured.
+
+**Step 1 — Read, don't write**
+- `~/the-custodian/canon/projects/consumer/project_charter_v0.1.md` — purpose, scope
+- `~/the-custodian/canon/projects/consumer/roadmap_v0.1.md` — planned phases
+- Scan repo root: README, directory structure, existing code or docs
+
+**Step 2 — Survey in-progress work**
+Look for TODOs, open branches, half-finished files. Note done vs. started but incomplete.
+
+**Step 3 — Propose workplans to Bernd**
+Propose 1–3 workplans — each a coherent strand, weeks to months, anchored to a
+roadmap phase. **Wait for approval before creating.**
+
+**Step 4 — Write the workplan file; fix-consistency registers it (ADR-001)**
+```
+workplans/PYTHON-WP-NNNN-<slug>.md   ← write this, commit it
+```
+Then register by running the consistency check — do **not** call
+`create_workplan`/`create_task` yourself; manual registration duplicates what
+C-06 creates from the file:
+```bash
+statehub fix-consistency --repo python-snake
+```
+C-06 creates the hub workplan + tasks and writes `state_hub_workstream_id`
+(legacy frontmatter name — holds the workplan UUID) and `state_hub_task_id`
+back into the file.
+
+**Step 5 — Record the setup**
+```
+add_progress_event(
+    summary="First session: structured consumer into N workplans, M tasks",
+    event_type="milestone",
+    topic_id="4c2e5315-2cb9-447c-9d16-a39bdb0aabd0",
+    detail={"workplans": [...], "tasks_created": M}
+)
+```
+
+<!-- Delete or archive this file once past first session -->