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>

docs/bugs-and-fixes.md

@@ -0,0 +1,104 @@
+# Bugs & Fixes
+
+Backlog of confirmed bugs with root cause analysis and implementation spec for the fix.
+
+---
+
+## BUG-001 — New entry not visible after form submission
+
+**Status:** fixed 2026-06-18  
+**Reported:** 2026-06-18  
+
+### Symptom
+
+After submitting a new post via `/post`, the entry page file is created correctly on disk but does not appear in the `/tracker` feed or in the Grav Admin panel until the cache is manually flushed.
+
+### Root cause
+
+Grav's page-tree cache (`cache/doctrine/`) is not invalidated when `add-page-by-form` writes a new page to disk. The tracker template uses `page.children`, which Grav serves from cache — so the new child page is invisible until the cache is cleared.
+
+### Workaround (manual)
+
+Run in terminal after each submission:
+
+```bash
+docker exec intotheeast_grav bash -c "cd /app/www/public && php bin/grav clearcache"
+```
+
+### Fix spec
+
+Wire cache-clear into the form process so it happens automatically on every successful submission.
+
+**Approach — custom Grav plugin event hook:**
+
+1. Create a small plugin `user/plugins/cache-on-save/` with one event listener:
+   - Listen on `onFormProcessed`
+   - When the form name is `new-entry`, call `$this->grav['cache']->clear()`
+2. Enable the plugin in `user/config/plugins/cache-on-save.yaml`
+
+This is the cleanest approach: it fires exactly once per successful submission, requires no changes to `post-form.md`, and works for any future forms too.
+
+**Alternative — disable page cache entirely:**
+
+Set `cache: { enabled: false }` in `system.yaml`. Simpler but degrades frontend performance; not recommended for production.
+
+### Files to create/modify
+
+| File | Change |
+|------|--------|
+| `user/plugins/cache-on-save/cache-on-save.php` | New plugin, ~30 lines |
+| `user/plugins/cache-on-save/cache-on-save.yaml` | Plugin manifest, enabled: true |
+| `user/config/plugins/cache-on-save.yaml` | Runtime config, enabled: true |
+
+### Acceptance criteria
+
+1. Submit a new post via `/post`
+2. Navigate to `/tracker` — the new entry is visible immediately, no manual cache flush needed
+3. Grav Admin also shows the new page immediately
+
+---
+
+## BUG-002 — Stale Twig cache after theme file changes
+
+**Status:** fixed 2026-06-18  
+**Reported:** 2026-06-18  
+
+### Symptom
+
+After theme template files are added or modified (e.g., creating `partials/base.html.twig`), Grav's Twig compiled-template cache still holds the old compiled version. Pages that extend the changed file throw 500 errors like "Template partials/base.html.twig is not defined" even though the file exists on disk.
+
+### Root cause
+
+Grav caches compiled Twig templates in `cache/twig/`. When a new file is added, existing templates that reference it don't know to recompile — their cache entries are still valid from their own mtime perspective.
+
+### Workaround (manual)
+
+Run after any theme file is added or changed:
+
+```bash
+docker exec intotheeast_grav bash -c "cd /app/www/public && php bin/grav clearcache"
+```
+
+### Fix spec
+
+Disable Twig template caching in development via `user/config/system.yaml`:
+
+```yaml
+twig:
+  cache: false
+```
+
+Acceptable for a single-user dev setup — eliminates both BUG-001's side-effect and this bug entirely. Performance cost is negligible at one-user scale. On production, leave Twig cache enabled (it's fine there because template files don't change at runtime).
+
+**Files to change:**
+
+| File | Change |
+|------|--------|
+| `user/config/system.yaml` | Add `twig: { cache: false }` under development section |
+
+### Acceptance criteria
+
+1. Add a new theme template file
+2. Reload any page — no 500 error, template works immediately without manual cache flush
+
+---