- Add read_discovery_answers() to parse discovery-log.md rows into dicts
with low_confidence and needs_followup boolean flags.
- Add append_followup_answer() to append follow-up rows linked to original Q-A IDs.
- Add 'ask-more' CLI command that detects Low-confidence and Follow-up-needed
answers, prompts for additional details, and records them in the log.
- Add 6 tests: read_discovery_answers round-trip, empty-log handling,
low-confidence detection, follow-up flag detection, and append_followup.
robbond