refactor(#1289): T5 — migrate the final idiom-hard callers off the core spine (#1290)
The last 4 core importers, migrated off non-destructure idioms:
- gsd-tools.cjs: core.{error,ERROR_REASON,setJsonErrorMode,output} -> io.cjs;
core.findProjectRoot -> project-root.cjs (lazy wrapper preserved); inline
resolveWorktreeRoot require -> worktree-safety.cjs
- audit-command-router: DI default `_core ?? core` -> `_core ?? io` (seam preserved)
- intel-command-router: DI default -> `{ output: io.output, timeAgo: coreUtils.timeAgo }` (seam preserved)
- check-command-router: io destructure -> io.cjs; dynamic core['planningDir']
-> planning-workspace, core['findPhaseInternal'] -> phase-locator (typed
imports, dropped the Record-cast bracket hack)
Allowlist is now EMPTY — NO file imports the core spine. core.cts re-exports
are dead weight; T-final deletes core.cts + remaining shim tests + the lint.
No behaviour change.
Closes #1289
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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