feat(openclaw): enable observation feed for OpenClaw agent sessions

Three fixes to make OpenClaw agent observations work end-to-end:

1. Session init in before_agent_start — the worker's privacy check
   requires a stored user prompt; without calling /api/sessions/init,
   all observations were skipped as "private"

2. Race condition fix in agent_end — await summarize before sending
   complete, preventing session deletion before in-flight observation
   POSTs arrive

3. OAuth token pass-through in buildIsolatedEnv — spawned Claude CLI
   processes now receive CLAUDE_CODE_OAUTH_TOKEN from the worker's
   env when no explicit API key is configured

Also adds agent-specific emoji mapping and dynamic project naming
for the Telegram observation feed.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

openclaw/openclaw.plugin.json

@@ -2,7 +2,7 @@
   "id": "claude-mem",
   "name": "Claude-Mem (Persistent Memory)",
   "description": "Official OpenClaw plugin for Claude-Mem. Records observations from embedded runner sessions and streams them to messaging channels.",
-  "kind": "memory",
+  "kind": "integration",
   "version": "1.0.0",
   "author": "thedotmack",
   "homepage": "https://claude-mem.com",