Limit message conversation output

[pheidon]

Summary

• wire the existing MessagesOptions limit through messages conversations
• add LIMIT clauses for synthetic and Apple chat.db conversation readers
• advertise --limit in command help
• add parser and reader regression coverage

Validation

• git diff --check
• GitHub PR Fast CI / CI Gate: passed on f1279eb
• Hermes/macOS: swift test --disable-sandbox passed
• Hermes/macOS: swift build -c release passed

Privacy

• this makes privacy-safe live validation easier by bounding messages conversations output
• no live Messages smoke test was run during validation, so no chat identifiers, names, or message values were queried or printed

[pheidon]

Reviewed this pass; no code defect found.

The new --limit wiring for messages conversations is carried through to both synthetic fixtures and the Apple chat.db reader, and the bounded SQL LIMIT behavior looks consistent with the command surface. I do not see a functional blocker in the implementation.

Merge call: functionally looks good; merge should still respect the repository approval/check requirements.

[athena-omt]

Reviewed the conversation limit change. I did not find a code defect: --limit is wired into , and the bounded LIMIT clauses cover both the synthetic reader and Apple path. Functionally looks good; merge should wait for the required approving review if branch protections require it.

[athena-omt]

Reviewed the conversation limit change. I did not find a code defect: --limit is wired into messages conversations, and the bounded LIMIT clauses cover both the synthetic reader and Apple chat.db path. Functionally looks good; merge should wait for the required approving review if branch protections require it.

[athena-omt]

Reviewed the conversation limit change. I did not find a code defect: --limit is wired into messages conversations, and the bounded LIMIT clauses cover both the synthetic reader and Apple chat.db path. Functionally looks good; merge should wait for the required approving review if branch protections require it.