ADR-857 rollout phase 2c. Move 11 shared low-level utilities out of core.cts into a new leaf module src/core-utils.cts: POSIX path normalization (toPosixPath), filesystem scanning (detectSubRepos, readSubdirectories, getPhaseFileStats, pathExistsInternal), and small pure helpers (generateSlugInternal, extractOneLinerFromBody, filterPlanFiles, filterSummaryFiles, timeAgo, and the private extractCanonicalPlanId). core.cts re-exports the 10 public ones (callers unchanged); extractCanonicalPlanId stays private (exported from the leaf for core's fs-search functions). Cycle-free: core-utils depends only on Node built-ins + already-leafed modules (phase-id for comparePhaseNum, planning-workspace for findContextMdIn). This is the shared leaf that unblocks the phase-locator fs-search extraction (2d) — searchPhaseInDir/findPhaseInternal/getArchivedPhaseDirs can now take their utilities from a leaf instead of from core. New-CLI-module checklist done (.gitignore, eslint, INVENTORY 93->94 + row, manifest, ARCHITECTURE, CONTEXT.md "Core Utilities Module"). Adds tests/core-utils.test.cjs (88 tests: behavioral + shim-identity + adversarial). Gates: lint, code-review, security-review, codex adversarial-review (0 findings). Mac 4041 pass; clean-build docker 12935 pass, 0 fail. Closes #877 Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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