feat(system): DPLAN-0088 auto STATUS.md sync on PR create/merge (#155)

- Trigger: add pr_created + pr_merged events (#13, #14) with fire-and-forget
  handler that runs `drone @prax status sync` (9 new tests, 191 total)
- Drone: wire trigger.fire() into pr_handler, pr_plugin, merge_plugin
  (lazy import, try/except — never blocks PR workflow, 447 tests)
- Flow: fix dashboard push failure on plan create
- Global prompt: remove compaction anxiety language, Patrick controls compaction

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/aipass/drone/apps/plugins/devpulse_ops/pr_plugin.py

@@ -193,6 +193,14 @@ def create_system_pr(description: str, caller: str) -> dict:
             },
         )
         logger.info(result["message"])
+
+        # Fire pr_created event (non-blocking — never fail the PR workflow)
+        try:
+            from aipass.trigger.apps.modules.core import trigger
+            trigger.fire("pr_created", branch=caller, pr_url=pr_url)
+        except Exception as exc:
+            logger.warning("trigger.fire('pr_created') failed: %s", exc)
+
         return result
 
     except (OSError, subprocess.SubprocessError) as exc: