Adds the middle tier between capture-off and autonomous capture: when
autonomy is disabled, detected durable-instruction signals record a
one-shot pendingSkillSuggestion on the session entry (signal-hash
fingerprint prevents transcript-history replay), and the next
non-heartbeat turn atomically consumes it and injects one bounded
user-role line offering to save the skill. The agent offers, the user
decides; skill_workshop approval flow unchanged; no new config.
1e2e7fb936
