fix(ci): validate gate finds ready PRs and always runs on dispatch

- Remove --draft filter from open_release_pr so validation works against
  both draft and ready-for-review release PRs
- On workflow_dispatch with no open PR, fail immediately instead of
  silently skipping
- On workflow_dispatch with a PR, always proceed regardless of src tree hash
- Cron path still uses should_validate to skip unchanged src trees

Author: vagabondHustler

.github/workflows/scripts/actions.py

@@ -710,7 +710,6 @@ def open_release_pr(self) -> str | None:
                 "dev",
                 "--state",
                 "open",
-                "--draft",
                 "--label",
                 "release",
                 "--json",

.github/workflows/scripts/jobs.py

@@ -343,15 +343,16 @@ def run(self) -> None:
         validation = ReleaseValidation()
         step_summary = StepSummary()
 
+        forced = os.environ["GITHUB_EVENT_NAME"] == "workflow_dispatch"
+
         number = validation.open_release_pr()
         if number is None:
+            if forced:
+                raise SystemExit("No open release PR found; cannot validate on manual dispatch.")
             step_summary.set_output("proceed", "false")
             return
 
-        event = os.environ["GITHUB_EVENT_NAME"]
-        forced = event == "workflow_dispatch"
-        scheduled = event == "schedule"
-        proceed = forced or (scheduled and validation.should_validate(number))
+        proceed = forced or validation.should_validate(number)
 
         step_summary.set_output("proceed", "true" if proceed else "false")
         step_summary.set_output("pr_number", number)