feat: add board Generate Now smoke spec (M4, skip-if-absent) — v1.5.0

Adds 06-board-generate-now.spec.ts for the PRAutoBlogger board Generate
Now control shipping in v0.21.0 (PR #166). Two tests:

1. Board page loads and #prab-generate-now button is present with nonce.
2. Kick-off AJAX (prautoblogger_generate_now) returns valid JSON — no PHP
   fatal, no wp_send_json_error from a missing nonce.

SKIP-IF-ABSENT: when #prab-board or #prab-generate-now is absent (M4 not
yet deployed) both tests skip with loud annotations so this e2e PR can
merge before prautoblogger PR #166 per the M2/M3 merge-order binding.

READ-ONLY: never waits for generation to complete; kick_off() is
idempotent (guards against duplicate cron scheduling).

Agent-Session: phase2-admin-m4-20260614

CHANGELOG.md

@@ -2,6 +2,17 @@
 
 All notable changes to the peptide-e2e smoke suite will be documented here.
 
+## [1.5.0] - 2026-06-14
+
+### Added
+- **Board Generate Now smoke (M4, skip-if-absent)** (`06-board-generate-now.spec.ts`).
+  Asserts the PRAutoBlogger board page loads, `#prab-generate-now` button is present
+  and carries a nonce, and the kick-off AJAX action returns valid JSON (no PHP fatal).
+  READ-ONLY: never waits for generation to complete; `kick_off()` is idempotent.
+  SKIPS with a loud annotation when `#prab-board` or `#prab-generate-now` is absent
+  (v0.21.0 M4 not yet deployed) so the e2e PR can merge before prautoblogger PR #166
+  per the M2/M3 merge-order binding. 27 tests total (was 25), delta = 2.
+
 ## [1.4.0] - 2026-06-12
 
 ### Added