docs: add agent-health-check.prose.md contract

The consolidated agent health check contract (wraps scripts/agent-health-check.py v4).
Created during earlier work but never committed — was a stray untracked file in
the execution clone, making the home look dirty to the fleet update path.

agent-health-check.prose.md

@@ -0,0 +1,98 @@
+---
+kind: responsibility
+name: agent-health-check
+description: >
+  Consolidated agent health verification for the LiteLLM + GPU + Zulip +
+  gateway fleet. Wraps scripts/agent-health-check.py (v4). Runs every
+  10 minutes via cron and on-demand via "run contract: agent-health-check".
+  Verifies: LiteLLM key validity, GPU port conflicts, agent Zulip streaming,
+  gateway liveness, CT liveness, config YAML integrity, wrapper/CLI integrity,
+  vault secret non-emptiness. NEVER restarts anything.
+title: Agent Health Check — Consolidated
+version: 1.0.0
+runtime_contract: 2
+agent: abiba
+---
+
+# Agent Health Check
+
+Consolidated health verification for the LiteLLM + GPU + Zulip + gateway fleet.
+Runs every 10 minutes via cron (`*/10 * * * *`) and on-demand. Never restarts
+anything — detects and reports only.
+
+## Requires
+
+- **LiteLLM admin key** for key validation (retrieved from `/root/.pi/agent/env.sh`)
+- **SSH access** to GPU hosts (.8, .110, .15) and agent CTs (.122, .129, .114, .24)
+- **Python 3** for script execution
+- **Network access** to LiteLLM (:4000), GPU exporters (:9400), and gateway endpoints
+
+## Maintains
+
+- last_check: timestamp — When the last full diagnostic ran
+- overall_severity: "healthy" | "degraded" | "critical"
+- liteLLM_keys: map of agent → key validity
+- gpu_ports: map of host → port conflict status
+- agents: map of agent → streaming health + gateway liveness
+- ct_liveness: map of CT → active status
+- config_integrity: map of config file → valid/invalid
+
+## Execution
+
+### check-health
+
+**RUN LIVE, NEVER ECHO — every dispatch must execute the script with real tool
+calls; never repeat a prior report unless a live probe fails.**
+
+```bash
+# Run the consolidated health check script
+python3 /root/scripts/agent-health-check.py --json
+```
+
+**Report format**: Begin every report with the **absolute path the script
+executed from** so a stale-consumer report is distinguishable from a real fault
+at read time. Summarize actual results from each check. Apply the standing probe
+rules: any HTTP status = ALIVE; only 000/timeout/refused = probe-failed.
+
+**Expected output**: JSON with `overall_severity` field. If `healthy`, report
+"Agent health check: OK". If `degraded` or `critical`, report the specific
+failures and their severity.
+
+### Probe Shape (per standing rules from 1150.msg)
+
+1. **Any HTTP status means ALIVE.** 200, 301, 302, 401, 403, 404 all prove the
+   service answered — report the code, never "down". A redirect is not a failure.
+   Only a failed CONNECTION (curl status 000, timeout, refused) is a failed probe.
+2. **A failed probe is never a service verdict.** Print
+   `probe-failed: <target> <kind>` naming the exact URL/host/port and the failure
+   kind (timeout, refused, no-route, dns), retry once at a longer timeout, and only
+   then report.
+3. **Say which probe produced each number.** "Grafana: 000" is unusable;
+   "Grafana http://192.168.68.116:3001/api/health -> connection timeout after 10s
+   (retried at 25s: also timeout)" is actionable.
+
+## Strategies
+
+### When LiteLLM keys are invalid
+Report the specific agent + key name. Do not attempt to fix — credential
+rotation is a separate operation.
+
+### When GPU port conflicts are detected
+Report the conflicting ports and processes. Do not kill processes — that's a
+destructive action requiring captain approval.
+
+### When gateway liveness is degraded
+Report the specific CT + gateway status. Do not restart unless the restart
+debounce window has passed.
+
+### When CT liveness is down
+Report the specific CT. Do not restart — that's a destructive action.
+
+### When config YAML is invalid
+Report the specific file + parse error. Do not fix — that's a config change.
+
+## Continuity
+
+- **Every 10 minutes**: Scheduled cron check while Abiba is running
+- **On `agent-health` command**: Run on-demand and report to user
+- **On critical alert**: Escalate to relay message immediately