fix(3727): wire --fix flag dispatch in code-review workflow (#3743)

* test(3727): add failing test for --fix flag dispatch in code-review workflow

Adds bug-3727-code-review-fix-flag-dispatch.test.cjs with:
- Pure-function tests on parseCodeReviewFlags() / resolveCodeReviewWorkflow()
  from new code-review-flags.cjs typed IR module
- Structural docs-parity tests asserting dispatch_fix step exists in
  code-review.md and that initialize step references code-review-flags.cjs

Structural tests FAIL today (RED): workflow has no dispatch_fix step and
no reference to code-review-flags.cjs in initialize. IR-level tests pass
because the lib module is introduced in this commit as the typed seam.

Fixes #3727

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix(3727): wire --fix/--all/--auto flags through code-review workflow

The initialize step now parses --fix, --all, and --auto from argv (via the
code-review-flags parser seam added in the previous test commit) and the
workflow dispatches gsd-code-fixer when --fix is truthy and the review
returned findings. Fixes the regression introduced when PR #2947 closed
#2946 without actually shipping the workflow dispatch.

Fixes #3727

* chore(3727): update changeset to reference PR #3743

The fix commit landed with the linked-issue number as the pr: field
placeholder. Updating to the actual PR number now that the PR is open.

* fix(3727): register code-review-flags.cjs in INVENTORY.md and manifest

Add missing row for get-shit-done/bin/lib/code-review-flags.cjs to the CLI
Modules table in docs/INVENTORY.md (count 72→73) and regenerate
docs/INVENTORY-MANIFEST.json to fix three failing CI tests:
  - cli-modules-doc-parity: every CLI module must have a row in INVENTORY.md
  - inventory-counts: headline "CLI Modules (N shipped)" must match file count
  - inventory-manifest-sync: INVENTORY-MANIFEST.json must match filesystem

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>