fix: bring the skill, plugin, README and API docs in line with the merged agent behaviour (release review)

The self-gate now says the skill reads saved Codex conversations offline outside a session; the staging
reference says only tagged input gets 409 during a guarded submit (the rest is held), and the API
reference notes a managed write past a full hold queue falls back to a direct write. Also: missing
reference rows, agent --help naming inspect/stage/submit, the tunnel opt-in in Remote Access, MCP wording.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/cli-agent.ts

@@ -1272,7 +1272,7 @@ export function registerAgentCommands(program: Command): Command {
   const agent = program
     .command('agent')
     .description(
-      'Talk to other sessions from inside one (any CLI mode): list, spawn, send, wait, read, interrupt, rm, and the inbox: post, inbox, ack'
+      'Talk to other sessions from inside one (any CLI mode): list, spawn, send, wait, read, interrupt, rm, the inbox: post, inbox, ack, and the experimental, opt-in inspect, stage, submit'
     );
 
   agent