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>

src/shared/EnvManager.ts

@@ -217,6 +217,14 @@ export function buildIsolatedEnv(includeCredentials: boolean = true): Record<str
     if (credentials.OPENROUTER_API_KEY) {
       isolatedEnv.OPENROUTER_API_KEY = credentials.OPENROUTER_API_KEY;
     }
+
+    // 4. Pass through Claude CLI's OAuth token if available (fallback for CLI subscription billing)
+    // When no ANTHROPIC_API_KEY is configured, the spawned CLI uses subscription billing
+    // which requires either ~/.claude/.credentials.json or CLAUDE_CODE_OAUTH_TOKEN.
+    // The worker inherits this token from the Claude Code session that started it.
+    if (!isolatedEnv.ANTHROPIC_API_KEY && process.env.CLAUDE_CODE_OAUTH_TOKEN) {
+      isolatedEnv.CLAUDE_CODE_OAUTH_TOKEN = process.env.CLAUDE_CODE_OAUTH_TOKEN;
+    }
   }
 
   return isolatedEnv;
@@ -257,5 +265,8 @@ export function getAuthMethodDescription(): string {
   if (hasAnthropicApiKey()) {
     return 'API key (from ~/.claude-mem/.env)';
   }
+  if (process.env.CLAUDE_CODE_OAUTH_TOKEN) {
+    return 'Claude Code OAuth token (from parent process)';
+  }
   return 'Claude Code CLI (subscription billing)';
 }