creds-audit: enforce per-site credential consolidation (SEC-009); prevents the DC0/DC1 spread ...

SEC-009 established "all site secrets live in ~/<site>-creds/" but nothing enforced
it, and it had two blind spots: VM-minted secrets (no forcing function to consolidate
-- office1-netbox's sandbox NetBox token went un-consolidated until needed) and silent
sprawl (a loose *.env in ~ had no detector). Standing up DC0/DC1 multiplies both.

Built (operator-directed):
- creds-manifests/<site>.manifest -- declares exactly the secrets a site must hold,
  each with mode + provenance (local, or <vm>:<path> for the VM-minted class).
  vr1-office1.manifest seeded (11 entries); the live folder audits CLEAN.
- scripts/creds-audit.sh <site> -- verifies the live ~/<site>-creds/ against the
  manifest (0700 folder, declared modes, present, non-empty), flags UNDECLARED files,
  and scans the home root for SPRAWL. Reads NO secret values (metadata only; harness
  T7 asserts no cat/head/tail/od/xxd). CREDS_ROOT/MANIFEST_DIR overrides for testing.
- tests/creds-audit/run-tests.sh (7/7) -- missing VM-secret, wrong mode, undeclared
  file, home-root sprawl, non-0700 folder, metadata-only. Auto-discovered by gauntlet.
- dc-dc-phase3 GATE -- non-negotiable close-out: consolidate + manifest each secret AT
  MINT TIME, and creds-audit $DC must be CLEAN before a DC is declared done.
- security-ledger SEC-009 ENFORCEMENT note.

Verified: harness 7/7; live creds-audit vr1-office1 -> CLEAN (also tool-confirms the
sandbox-token gap is closed); gauntlet ALL GREEN (59); repo-lint 0 fail.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015WgVrZE2ryY9aXP7JiBuwj