test(smoke): dossier page smoke guard — assert HTTP 200 + #prab-dossier + no fatal (v1.2.0)

Adds dossier smoke test to 03-admin-plugins.spec.ts (describe block:
'WP Admin — PRAutoBlogger Article Dossier').

Guards:
- Menu-ordering regression: wrong hookname -> wp_die 404 (same class as v0.19.1 board bug)
- PHP fatal on dossier load
- Missing #prab-dossier container (template regression)
- Stage-section regression (conditional on run data existing)

Defensive strategy:
- Tries canonical staging posts 925/930 via REST API first
- Falls back to most recent post via /wp-json/wp/v2/posts
- Falls back to post_id=0 (graceful empty state) with loud test.info() annotation
- Stage-section assertions conditional: if stages present they must render; if absent
  the pre-substrate graceful state is expected (no failure)

npx playwright test --list shows 24 tests (was 23).
New test at 03-admin-plugins.spec.ts:185.
TypeScript compiles without errors.

Part of PRAutoBlogger v0.19.2 M2 milestone. Companion PR: peptiderepo/prautoblogger#158.

Agent-Session: claude-sonnet-4-6

CHANGELOG.md

@@ -2,6 +2,20 @@
 
 All notable changes to the peptide-e2e smoke suite will be documented here.
 
+## [1.2.0] - 2026-06-12
+
+### Added
+- **Dossier page smoke test** (`03-admin-plugins.spec.ts` — `WP Admin — PRAutoBlogger Article Dossier`).
+  Navigates to `/wp-admin/admin.php?page=prautoblogger-dossier&post_id=<N>`, asserts HTTP 200,
+  `#prab-dossier` container visible, body does NOT contain "Invalid plugin page" or "Fatal error".
+  Guards against: menu-ordering regression (wrong hookname → wp_die 404), PHP fatals on dossier
+  load, missing dossier container, and stage-section regression.
+
+  Defensive strategy: tries canonical staging post IDs 925/930 first, then falls back to the
+  most recent REST post, then falls back to post_id=0 (graceful empty state). Stage-section
+  assertions are conditional on a run record existing. Loud test.info() annotations on fallback
+  paths. New in PRAutoBlogger v0.19.2.
+
 ## [1.1.0] - 2026-06-12
 
 ### Added