fix(opencode,hermes): honor "stop ponytail" and keep review out of the OpenCode flag

[ishank-ninja]

Problem

The injected ruleset tells the model that ponytail turns off with "stop ponytail" / "normal mode". The Claude/Codex hooks and pi honor that via isDeactivationCommand, but two hosts don't:

• Hermes: _pre_llm_call ignores user_message. pre_llm_call(user_message='stop ponytail') returns the full "ACTIVE EVERY RESPONSE" ruleset, and so does every later turn.
• OpenCode (.opencode/plugins/ponytail.mjs): no hook looks at chat messages, so "stop ponytail" does nothing. Separately, /ponytail review goes through normalizePersistedMode and is written to the long-lived .ponytail-active. Every later session then injects only the one-line level: review stub instead of the ruleset. This is the same class of bug as /ponytail-review latches the session mode flag, replacing the ruleset with a pointer line for the rest of the session #736; review is session-only per hooks/ponytail-config.js: 'review' in VALID_MODES but not RUNTIME_MODES — config accepts it but silently falls back to 'full' #377.

Fix

• Hermes: _pre_llm_call reads user_message. A standalone "stop ponytail" / "normal mode" sets the mode to off, exactly like /ponytail off. That means the whole message, case-insensitive, trailing punctuation ignored, the same rule as isDeactivationCommand. State stays process-wide as today, with a ponytail: comment naming that ceiling.
• OpenCode:
  • A new chat.message handler (V1 plugin API, packages/plugin/src/index.ts) reuses isDeactivationCommand on the user's non-synthetic text parts and persists off.
  • /ponytail and readMode accept only runtime levels (normalizeMode). review is never persisted, and an existing stale review flag falls back to the default.

Tests

• tests/opencode-plugin.test.js:
  • /ponytail review doesn't overwrite the flag;
  • a stale review flag injects the full ruleset;
  • chat.message turns ponytail off on "Stop ponytail!" (with a synthetic attachment part present), but not on "add a normal mode toggle…".
• tests/hermes-plugin.test.js:
  • a mention keeps injecting;
  • "Stop Ponytail!" returns no context on that turn and the next;
  • /ponytail lite re-enables it.
• The new tests fail on main. npm test passes.

The OpenCode diff is kept minimal so it rebases cleanly onto the V2 rewrites in #864, #729 and #734. Whichever of those lands should carry the chat.message deactivation and the runtime-only persistence forward. #787 also edits Hermes _pre_llm_call (a small textual conflict).

🤖 Generated with Claude Code

[ishank-ninja]

Closing because these were opened due to a task-scope misunderstanding.