D-137 phase 2: fix the eight confirmed false-greens, regression-lock each ...

Tier 2 is now scoped by (host-role, SITE-KEY). Keying on role alone merged
all three jumphost creds folders into one basename namespace, so a credential
present at ANY site satisfied the row for EVERY site -- how SEC-021's dc0
opnsense-api.txt absence passed a green sweep while tier 1 flagged it. Four
committee lenses converged on this. vm-secret-locations gains a site column.

Also fixed, each reproduced by the committee and each now regression-locked:
- probe_remote called a successfully-read location UNREACHABLE when its glob
  matched nothing, gating the role and turning every absence FAIL there into
  an [ok]; a __DONE__ liveness marker now separates "ran, found nothing" from
  "could not reach".
- literal-file locations skipped absent/unreadable detection entirely (the
  T33 false green surviving in the other path form).
- an EMPTY locations list bypassed ruling 3's refusal.
- a zero-row matrix reported clean over the empty set.
- a mint-ref pointing at a directory crashed with exit 1 -- indistinguishable
  from findings -- and skipped S5/S6/S7, silently dropping the conflation and
  asymmetry findings.
- mode enforcement was custody-gated, leaving 43 of 77 rows unchecked
  including the SEC-020 and SEC-022 stores; a world-readable check now
  applies at any custody.
- S5's dc1->dc0 direction was untested; deleting it left the harness green.
- rows with no declared location for their scope are disclosed, not skipped.
- declared paths/targets are charset-validated and shell-quoted: an
  unvalidated `;` reached a remote shell, under sudo when --privileged.
- creds-audit sprawl globs now cover dotfiles; the prior widening could not
  see .admin.pass, the dotfile sibling of its own motivating secret.

T24 replaced with a checked-in finding-CLASS baseline. The old form grepped
for the literal "IDENTITY CONFLATION", so REMEDIATING that defect would have
turned the gauntlet red for whoever did the right thing -- making "edit the
test" the cheapest response exactly when the guard mattered.

Harness 35 -> 43, creds-audit 13 -> 15, gauntlet ALL GREEN (80), lint 0-fail.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HvCyrwvYTTcDYnRErfMsNf