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Prove PITR recovery with real PostgreSQL rewind and recovery-mode reboot - #58
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Proves PITR recovery with a real-target rehearsal: full-database pg_basebackup plus WAL replay with timeline-history validation (last-branch for repeated rewind), pre-existing ALTER/DROP/sequence-value rewind plus post-T0 vanishes, real host PIDs/workspaces surviving the PGDATA wipe, OS-process recovery-mode boot with fresh UUIDv7 plus fleet quarantine, and claim/stale/reconcile/cleanup gates with reconciled_generation advancement on :5545 plus a second physical restore proving G4 distinct/newer. Rows-only drills stay marked as logic-only precursors; full cgroup.kill specifics stay covered by the real-cgroup drill. Verified: python unittest 33 pass, PitrHistoryValidatorTest 5 pass, test-compile success, bash -n clean, gofmt clean. Closes #40.