feat: LiteLLM API key management contract + longevity policy

- New contract: litellm-api-keys.prose.md — create/rotate/verify named API keys
- Renamed tanko key alias from tanko-jul2026 to tanko (bare name)
- Added Key Longevity Policy: permanent keys (duration:null), event-driven rotation
- Added default_key_generate_params to litellm config (permanent + 00 budget)
- Updated hermes-key-enforcement verified agents table for 2026-07-04

hermes-key-enforcement.prose.md

@@ -96,11 +96,31 @@ curl -s -H "Authorization: Bearer sk-NEW_KEY" http://192.168.68.116/v1/models
 
 **Done.** No config file changes needed. The agent picks up the new key on restart.
 
-## Verified Agents (2026-07-03 final)
+## Key Longevity Policy (2026-07-04)
+
+**Keys are permanent and use bare agent name aliases.**
+
+- **Duration**: `null` — keys never expire. This is enforced by `default_key_generate_params` in `litellm_config.yaml`.
+- **Alias convention**: bare agent name only (e.g., `tanko`, `mumuni`, `koby`, `koonimo`). No dates, no versions. The alias IS the identity.
+- **Rotation triggers**: compromise, personnel departure, or quarterly security hygiene. NOT calendar-driven.
+- **Max budget**: $100 per key (config default).
+
+```yaml
+# In litellm_config.yaml — ensures all future keys inherit these defaults:
+litellm_settings:
+  default_key_generate_params:
+    models: ["syslog-auto", "qwen3.6-27B-code", "gemma-4-12b"]
+    duration: null        # ← permanent
+    max_budget: 100
+    metadata:
+      purpose: "agent-inference"
+```
+
+## Verified Agents (2026-07-04 final)
 
 | Agent | CT | Status | api_key_env entries | Hardcoded harness | Last Verified |
 |-------|-----|--------|---------------------|-------------------|---------------|
-| Tanko | 112 | ✅ Compliant | 4 | 0 | 19:14 EDT |
+| Tanko | 112 | ✅ Compliant (key: tanko) | 4 | 0 | 22:45 EDT |
 | Mumuni | 114 | ✅ Compliant | 8 | 0 | 19:14 EDT |
 | Koby | 111 | ✅ Compliant | 14 | 0 | 19:14 EDT |
 | Koonimo | 113 | ✅ Compliant | 7 | 0 | 19:14 EDT |