docs: daily documentation audit 2026-05-20

[jonschull]

Summary

• Fix `com.era.system-health-check` status: was "Running", exits code 1 (no active PID in launchd). Closes Doc drift: com.era.system-health-check listed as Running but exits with code 1 #2008.
• Fix Fathom legacy sync status: was "Disabled", live crontab shows active `0 4 * * *` entry (`run_fathom_daily.sh`). Closes Doc drift: Fathom legacy sync marked Disabled in CLAUDE.md but crontab entry is active #1988.
• All other open DD drift issues verified as already resolved in prior audits or out of scope for era2c docs.

Test plan

• Verified live crontab: `0 4 * * * /bin/bash /Users/admin/.local/bin/run_fathom_daily.sh` is present and uncommented
• Verified launchd: system-health-check not loaded, no active PID
• Doc-only change, no code affected

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