Remove confusing `parallelizable` boolean field. It was redundant -
execute-phase already computes parallelizability from `depends_on`
and file conflicts.
Changes:
- Remove `parallelizable: true|false` from plan frontmatter
- Rename `files_exclusive` to `files_modified` (clearer intent)
- Simplify execute-phase dependency detection logic
- Update phase-prompt template and plan-phase workflow
Parallelization is now fully automatic based on:
- `depends_on: []` (empty = independent)
- `files_modified: [...]` (no overlap = can parallelize)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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