Fix BUG-001 and BUG-002; add post-submission QA test plan and QA entry

BUG-001: cache-on-save plugin clears page cache on onFormProcessed so
new entries appear in the tracker feed immediately after submission.

BUG-002: disabled Twig template cache (twig.cache: false) so theme
file changes take effect without a manual cache flush.

Also adds bugs-and-fixes.md, corrects TC-P test URLs (.entry suffix),
fixes TC-P.1 expectation (inline login form, not a redirect), and
creates the QA test entry for automated scenario verification.

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

.gitignore

@@ -1,2 +1,3 @@
 /plugins/
+!/plugins/cache-on-save/
 /data/