docs: self-update contract — Gen 6 postconditions, status clarification, state persistence

- Added stream_subscription_check, dm_response_time_offline_verifiable, known_issues_tracked postconditions
- Added 'Status' section clarifying active for Hermes agents only (not retired with pi Zulip)
- Added 'State Persistence' section with KG node schema for build-zulip-plugin:state
- Execution step 4: always run offline tests (simulate_dm_latency, selftest)
- Execution step 5: update KG state node after each generation

build-zulip-plugin.prose.md

@@ -21,9 +21,11 @@ description: >
   - connected == true — Establishes and maintains Zulip event queue
   - reconnect_on_failure == true — Reconnects after queue expiry
   - recovers_from_network_loss == true — Handles temporary network drops
+  - stream_subscription_check == true — Bot is subscribed to primary streams (Gen 5+)
   
   *Message Flow*
   - dm_response_time_ms < 10000 — DMs get a response within 10 seconds
+  - dm_response_time_offline_verifiable == true — simulate_dm_latency() passes without live Zulip (Gen 6+)
   - stream_mention_detection == true — @mentions in streams are detected and routed
   - all_bots_detection == true — @all-bots mentions are detected
   - echo_loop_prevention == true — Never replies to its own messages
@@ -38,6 +40,14 @@ description: >
   - graceful_disconnect == true — shutdown doesn't crash
   - handles_malformed_messages == true — Bad JSON doesn't kill the poll loop
   - typing_indicators_work == true — Sends typing notifications
+  - known_issues_tracked == true — add_known_issue() persists problems across generations (Gen 6+)
+
+## Status
+
+**Active** — for Hermes agents only. This plugin is NOT retired. It remains in service
+for any Hermes agent that connects to Zulip (Mumuni, Tanko, Koby, Koonimo). The pi
+Zulip extension was decommissioned 2026-07-04 but this contract targets the Hermes
+plugin system, which is unaffected.
 
 ## Parameters
 
@@ -90,13 +100,28 @@ Each generation stores:
 
 ## Execution
 
-1. **Read state** — Check previous generations from knowledge graph
+1. **Read state** — Check previous generations from knowledge graph node `build-zulip-plugin:state`
 2. **Generate or improve** — Based on generation count:
    - Generation 1: Scaffold full plugin from scratch
    - Generation N: Read previous code, apply improvements
 3. **Validate** — Syntax check, structure check, dependency check
-4. **Log** — Save generation result to knowledge graph as [LEARN]
+4. **Run offline tests** — Always run `simulate_dm_latency()` and selftest() if no live Zulip
-5. **Report** — Output what was generated, what changed, what needs review
+5. **Log** — Save generation result to knowledge graph as [LEARN] node. Update the
+   `build-zulip-plugin:state` node with current generation_count, plugin_version,
+   and known_issues.
+6. **Report** — Output what was generated, what changed, what needs review
+
+## State Persistence (Gen 6+)
+
+All generation state is stored in a knowledge graph node titled `build-zulip-plugin:state`:
+- `generation_count` — incremented on each verified run
+- `plugin_version` — current version string
+- `last_generation` — ISO timestamp of most recent run
+- `known_issues` — array of unresolved issues carried forward
+- `last_postcondition_results` — pass/fail map from most recent verification
+
+Agents executing this contract MUST read this node on startup and update it after
+validation. If the node does not exist, create it with generation_count=1.
 
 ## Example Output