H: inquiry agent should honor exact literal response requests

[ccisnedev]

Problem\nIn H mode (--agent inquiry) with local gemma4, prompts requesting exact literal output can include extra text after the token.\n\n## Goal\nEnsure firmware guidance explicitly enforces exact-literal output when the user requests exact response strings for validation runs.\n\n## Acceptance\n- Prompt guidance includes exact-literal rule.\n- Regression test validates rule text exists in firmware prompt.\n- CLI H validation run still executes iq fsm state --json and can end with exact token output.\n