v1.3.0

Changelog

• 25ad220 feat(setup): --rules/--no-rules flags + opt-in prompt for global guidance
• 69b1349 feat(setup): RuleWriter interface, file/manual writers, WriteRules orchestrator
• 9b3e744 feat(setup): rule content + idempotent marker-block writer (shared atomicWrite)
• 4c0520b merge: setup rules step (optional global release-and-resume install)
• 90ce2ef refactor(setup): detect rule-write failure via RuleResult.Err, not output text