gsxdsm 8c3758584b refactor(engine): peel merger glob, test-command, and file-scope satellites (#2143) ...

## Summary

Wave 2 of package code organization (follows merged #2139): peel
pure/satellite clusters out of `packages/engine/src/merger.ts` while
keeping `merger.js` import paths stable for tests and production.

- **`merger-glob.ts`** — `ConflictType`, `LOCKFILE_PATTERNS`,
`GENERATED_PATTERNS`, `matchGlob`
- **`merger-workspace-test-commands.ts`** — pnpm workspace package
mapping + `inferDefaultTestCommand` / scoped + file-scoped test command
derivation
- **`merger-file-scope.ts`** — `parseDiffStat`, `extractFileScope` /
`matchesScope`, squash file-scope invariant (`FileScopeViolationError`,
assert/enforce with main’s `status` audit semantics and merge-trait
modes)
- Re-exports from `merger.ts`; baseline ratchet for `merger.ts` (~12.5k
→ ~11.8k)

## Test plan

- [x] `pnpm --filter @fusion/engine exec tsc --noEmit`
- [x] eslint on merger + satellites
- [x] `merger-file-scope-invariant.test.ts` (18 tests)
- [x] focused conflict-resolution pattern tests
- [ ] CI merge gate

## Plan

Continues
`docs/plans/2026-07-14-001-refactor-package-code-organization-plan.md`
(U6 merger satellites).

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **New Features**
* Added file-scope validation for merge operations, with strict and
warning-only enforcement options.
* Added automatic classification of lockfile and generated-file
conflicts.
* Added workspace-aware test selection based on changed packages and
files.
* Added support for inferring test commands across pnpm, Yarn, Bun, and
npm projects.

* **Refactor**
* Organized merge, conflict-resolution, file-scope, and test-inference
functionality into dedicated modules without changing existing public
access paths.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

2026-07-15 14:44:35 -07:00

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