Update spec and plan with architect review corrections
Key changes:
- Defer Phase 5 (template deduplication) to v7.0.0: route_maps are not identical, BGP dedup blocked by Python module-level scoping, OSPF has fundamentally different command paradigms
- Add .git-blame-ignore-revs step to Phase 1
- Add missing test cases: overridden/rendered for resource modules, aggregate/purge/with_address for vyos_vlan
- Fix incorrect claim that version.py LooseVersion is unused
- Add sequential merge requirement to preamble
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>