conductor(deob_lexicon_v2): Initialize v2 track scaffold + V2_CHANGELOG
The corrective pass track is initialized with:
- spec.md: 14 sections, 8 corrections + 3 refinements + 4 template notations + 2 << >> placements
- plan.md: 7 atomic tasks, per-file commits with git notes
- metadata.json: scope, verification criteria, risk register, user-directives-logged
- state.toml: 2 phases, 7 + 2 tasks
- README.md: track index + cross-references
- V2_CHANGELOG.md: 17 v1->v2 changes documented + out-of-scope items
The 5 source files (lexicon.md, terms_catalog.md, dedup_map.md, prompt_template.md, report.md) are NOT yet modified; this commit is the track scaffold + changelog. The 5 source file changes follow in separate commits.
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