Implement WARDEN-WP-0024 experiential memory and agent sessions.

Add phase-memory bridge, warden memory CLI, route/access/sign recording,
memory-aware worker planning with OpenRouter skip, tests, wiki, and AGENTS.md
orientation for Claude, Codex, Grok, and future agent sessions.

AGENTS.md

@@ -156,6 +156,29 @@ get wrong.
 <!-- Append repo-specific agent instructions below this marker.
      The state-hub template sync preserves content after this line. -->
 
+## Experiential memory (WARDEN-WP-0024)
+
+ops-warden shares a **phase-memory** store across worker ticks, coding agent
+sessions, and operator CLI use.
+
+**At session start** (Claude Code, Codex, Grok, or future agents):
+
+```bash
+export WARDEN_AGENT_ID=grok   # or claude, codex
+warden memory activate --json
+```
+
+**During work:** use normal `warden route` / `warden access` / `warden sign`;
+episodes are recorded automatically unless `WARDEN_MEMORY=0`.
+
+**Store:** `~/.local/share/warden/memory/` (override: `WARDEN_MEMORY_STORE`).
+
+**Worker:** `warden worker run --brain llm` skips OpenRouter when stabilized
+routing memory matches. See `wiki/OpsWardenMemory.md`.
+
+Requires `phase-memory` on `PYTHONPATH` or installed; contract in
+`phase-memory/docs/ops-warden-memory-contract.md`.
+
 ---
 
 ## Workplan Convention (ADR-001)