test(architecture): guard top-level timers + add startup-contract smoke test

Add a tiny source-level architecture suite at
tests/test-architecture-startup-contracts.el with two checks:

- Only keybindings.el may globally own the exact C-; prefix.  Catches
  accidental cross-module rebinding before it ships.
- Top-level timer scheduling (run-with-timer / run-at-time /
  run-with-idle-timer) must be guarded by (unless noninteractive ...)
  so requiring a module in batch / test mode does not schedule
  startup timers.  Timer calls inside defuns are exempt -- the test
  only rejects forms that execute their body when the module loads.

Four modules had unguarded top-level timer scheduling and would have
tripped the new test.  Wrap their startup hooks/timers in
(unless noninteractive ...):

- modules/org-agenda-config.el: 10s idle cache build
- modules/org-refile-config.el: 5s idle cache build
- modules/quick-video-capture.el: after-init-hook + 2s fallback
- modules/wrap-up.el: emacs-startup-hook bury-buffers delay

The contract being protected is "requiring a module in batch should
not start a clock running."  Test failures will now point straight at
the offending file/form.

1 files changed, 8 insertions, 7 deletions

diff --git a/modules/org-refile-config.el b/modules/org-refile-config.el
index 63343e9f..16b37bf9 100644
--- a/modules/org-refile-config.el
+++ b/modules/org-refile-config.el
@@ -101,13 +101,14 @@ so caching improves performance from 15-20 seconds to instant."
                               (- (float-time) (float-time start-time)))))))
     (setq org-refile-targets targets)))
 
-;; Build cache asynchronously after startup to avoid blocking Emacs
-(run-with-idle-timer
- 5  ; Wait 5 seconds after Emacs is idle
- nil ; Don't repeat
- (lambda ()
-   (cj/log-silently "Building org-refile targets cache in background...")
-   (cj/build-org-refile-targets)))
+;; Build cache asynchronously after startup to avoid blocking Emacs.
+(unless noninteractive
+  (run-with-idle-timer
+   5  ; Wait 5 seconds after Emacs is idle
+   nil ; Don't repeat
+   (lambda ()
+     (cj/log-silently "Building org-refile targets cache in background...")
+     (cj/build-org-refile-targets))))
 
 (defun cj/org-refile-refresh-targets ()
   "Force rebuild of refile targets cache.