Fix dsh-local-project plugin boot crash (Dynamic require of events) + re-patch every start

exists(): only accept real files; probe: drop open()-based test

Tolerate stray opposite-compression artifacts + stat-based exists()

Fix empty session sidebar on HF bucket storage (readdir d_type)

Also fix credentials owner-only boot check on HF bucket storage

Fix session save on HF storage: replace hard-link publish with rename