fix(org): surface directory-scan failures instead of crashing or hiding them

The refile target scan caught permission-denied and silently dropped the directory, and would crash outright on a missing root (only permission-denied was caught, so a missing code-dir/projects-dir raised file-missing and aborted the whole build). The agenda build had the same crash: cj/add-files-to-org-agenda-files-list called directory-files on projects-dir with no existence check.

Extracted cj/--org-refile-scan-dir, which warns (display-warning) and returns nil for a missing, unreadable, or permission-denied root so the rest of the scan continues. Guarded the agenda scan the same way. Both now log a concise warning naming the skipped directory rather than failing silently or fatally.

Also fixed a latent bug surfaced here: org-refile-targets was never declared special, so under make compile cj/org-refile-in-file let-bound it lexically and the scoped targets never reached org-refile. Added (defvar org-refile-targets) so the binding stays dynamic when byte-compiled. Tests cover the helper (missing/permission-denied/normal) and the agenda missing-dir guard.

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