Builder [02] session close 08/04-05/26 -- Gym Logger verified ready, DEFAULTS-REG + BUILD-DIARY fixed, self-corrected a mistake, flagged new SNAPSHOT over-firing issue

Verified Gym Logger fully functional for tomorrow's gym use (load/save live, JS clean, 15 sessions intact). Cross-checked handoff open items against records.db/inbox -- T041 confirmed closed, T323 was a wrong code (real: T702, closed), ARTIFACTS-02.md 404 explained (wrong suffix). Fixed DEFAULTS-REG.md Gym Logger pointer and BUILD-DIARY.md gap-fill entry. Self-caught and fixed a mid-session mistake (HANDOFF.php test call wiped live handoff file). Diagnosed a platform-wide 503 outage as transient/known-pattern, not a new bug. Corrected an inaccurate directory-emptiness claim (file-reader.php can't list directories at all) after David provided direct screenshot evidence. Found unfiled issue: SNAPSHOT.php firing every 20-40min on 08/04/26 instead of once/day.