When a pnpm workspace is detected and git context is available,
inferDefaultTestCommand now derives the set of packages touched by the
branch diff (git diff --name-only <base>...HEAD) and emits:
pnpm --filter "<pkg>...^" test
instead of the broad `pnpm test`. The `...^` suffix includes dependents
so packages that import the changed one are also exercised. Falls back
to unscoped `pnpm test` when git context is missing, the workspace has
no package roots, or all changed files are at the root (e.g. config).
New exports: parsePnpmWorkspaceGlobs, resolveWorkspacePackageRoots,
mapChangedFilesToPackageNames, deriveScopedPnpmTestCommand.
testSource is now "inferred-scoped" for the scoped path.
Tests added: parsePnpmWorkspaceGlobs (7), resolveWorkspacePackageRoots
(4), mapChangedFilesToPackageNames (4), inferDefaultTestCommand scoping
(6). All 466 merger test files pass.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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