Add adversarial tests for verify-semantic-motion.py and verify-sequence-oauth.py (#69)

* Add adversarial tests for verify-semantic-motion.py and verify-sequence-oauth.py

Every other verify-*.py in scripts/ has a matching test-verify-*.py
(verify-docs-sync, verify-geometry, verify-motion, verify-plugin-package),
and CONTRIBUTING.md lists both verify-semantic-motion.py and
verify-sequence-oauth.py as required PR gates, but neither had a dedicated
test file exercising its own pass/fail behavior.

- test-verify-semantic-motion.py: asserts the shipped SKILL.md /
  semantic-patterns.md / animation.md and the policy-trace animated example
  pass verify_markdown()/verify_example(), plus adversarial cases for a
  missing semantic-pattern router link, a missing pattern name, and a
  duplicate HTML/SVG id in the example.
- test-verify-sequence-oauth.py: CLI smoke-tests the shipped repo (expects
  ALL GATES PASSED) and an adversarial case that removes the dashed-return
  marker from the OAuth 401 response in a temporary copy of the repo tree
  (verify-sequence-oauth.py resolves paths from its own __file__, so the
  adversarial run executes the copied script against the copied tree).

Also wires both new tests into CONTRIBUTING.md's gate table and combined
validation command, following the exact pattern used for the existing
test-verify-*.py gates. (CI workflow wiring left out of this PR since it
touches .github/workflows/ci.yml — happy to add in a follow-up if useful.)

* Address review feedback on PR #69

- Wire test-verify-semantic-motion.py and test-verify-sequence-oauth.py
  into .github/workflows/ci.yml so CONTRIBUTING's new gates actually run
  in CI, with matching step-summary rows.
- Bump .claude-plugin/plugin.json and .codex-plugin/plugin.json in sync
  to 2.5.7 so scripts/verify-plugin-package.py origin/main passes again.
- Simplify test-verify-sequence-oauth.py's adversarial fixture to copy
  only the files verify-sequence-oauth.py's main() reads before the
  dashed-return check (type-sequence.md + cold-cache/oauth example
  trios), instead of shutil.copytree of the whole repository.

* Re-bump plugin manifests above current main

The prior 2.5.7 bump was superseded by subsequent merges of main into
this branch (main itself advanced past it to 2.6.5). Re-run
bump-plugin-version.py so the branch is strictly above upstream main
again (2.6.6), per @philyuchkoff's review: the diff had settled back
to no version delta at all.

---------

Co-authored-by: alvinhui <alvinhui@users.noreply.github.com>
Co-authored-by: Cathryn Lavery <50469282+cathrynlavery@users.noreply.github.com>

.github/workflows/ci.yml

@@ -155,6 +155,16 @@ jobs:
         id: oauth
         run: python scripts/verify-sequence-oauth.py
 
+      - name: Verify semantic-motion verifier
+        if: always()
+        id: semantic_motion_tests
+        run: python scripts/test-verify-semantic-motion.py
+
+      - name: Verify sequence-oauth verifier
+        if: always()
+        id: oauth_tests
+        run: python scripts/test-verify-sequence-oauth.py
+
       - name: Verify draw.io import script
         if: always()
         id: drawio
@@ -327,6 +337,8 @@ jobs:
           echo "| Color Palette & Skin Linter | ${{ steps.skin.outcome == 'success' && '✅ Passed' || (steps.skin.outcome == 'skipped' && '⏭️ Skipped' || '❌ Failed') }} |" >> $GITHUB_STEP_SUMMARY
           echo "| Quantitative Polar Chart | ${{ steps.polar.outcome == 'success' && '✅ Passed' || (steps.polar.outcome == 'skipped' && '⏭️ Skipped' || '❌ Failed') }} |" >> $GITHUB_STEP_SUMMARY
           echo "| Sequence Diagram Grammar | ${{ steps.oauth.outcome == 'success' && '✅ Passed' || (steps.oauth.outcome == 'skipped' && '⏭️ Skipped' || '❌ Failed') }} |" >> $GITHUB_STEP_SUMMARY
+          echo "| Semantic-Motion Verifier Tests | ${{ steps.semantic_motion_tests.outcome == 'success' && '✅ Passed' || (steps.semantic_motion_tests.outcome == 'skipped' && '⏭️ Skipped' || '❌ Failed') }} |" >> $GITHUB_STEP_SUMMARY
+          echo "| Sequence-OAuth Verifier Tests | ${{ steps.oauth_tests.outcome == 'success' && '✅ Passed' || (steps.oauth_tests.outcome == 'skipped' && '⏭️ Skipped' || '❌ Failed') }} |" >> $GITHUB_STEP_SUMMARY
           echo "| Draw.io Import Extractor | ${{ steps.drawio.outcome == 'success' && '✅ Passed' || (steps.drawio.outcome == 'skipped' && '⏭️ Skipped' || '❌ Failed') }} |" >> $GITHUB_STEP_SUMMARY
           echo "| Mermaid Import Extractor | ${{ steps.mermaid.outcome == 'success' && '✅ Passed' || (steps.mermaid.outcome == 'skipped' && '⏭️ Skipped' || '❌ Failed') }} |" >> $GITHUB_STEP_SUMMARY
           echo "| Optional Motion Contract | ${{ steps.motion.outcome == 'success' && '✅ Passed' || (steps.motion.outcome == 'skipped' && '⏭️ Skipped' || '❌ Failed') }} |" >> $GITHUB_STEP_SUMMARY