Add IncusOS break-fix guide, incusos-health helper, immutability rules
Phase 4: Explore IncusOS immutability via the /os/1.0 API:
- incusos-health script with --status/--partitions/--tpm/--services/--network/--update
- Validated: TPM encryption (root+swap), Secure Boot with 4 certs, ZFS pool
- Documented A/B partition scheme, update mechanics, security chain
- Defined 4 break-fix exercises (update observation, failed update, network
isolation, full node failure) with safety rules and pickup points
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Maarten
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