hub v0.68.0 — auth_failed self-heal, consumed_at honesty gauge, wrapper drift (R-39 + R-50b(a))

Completes the hub half of R-39's fleet fix on top of the generation core (c484aa2).

pbsdrheal gains an auth_failed TRIGGER — a new trigger in the existing machine, not a
new machine. A box whose credential PBS rejects escalates to a fresh mint, never a
re-stage (which would re-feed the secret PBS just rejected), through the EXISTING damper:
a 401 flap must not become a secret-minting chain. With the generation stamp this closes
the loop end to end — agent proves the 401, hub re-keys, generation advances, descriptor
hash moves, agent re-consumes.

consumed_at honesty gauge: a staged secret still unconsumed past a 15-minute grace while
the box reports `applied` is surfaced with its own event. That is the exact 2026-07-18
fingerprint and a disagreement no single tier can see alone. Deliberately a SURFACE, not
a heal — auto-re-issuing on it would mint a second secret on top of an unconsumed one,
which is the mint/consume race R-39(a) already recorded. One event per distinct report,
and an honestly-stuck box does not double-report (its unconsumed secret is the symptom
being healed, not a contradiction).

R-50b(a): ArtifactManifest.WrapperSHA256 + operator field + host-page drift surface. The
PBS wrapper is root-owned 0755 and the pinned sudoers vector, yet installed unversioned
from raw/branch/main and absent from every manifest. Agents >=0.91.0 report the installed
hash; a mismatch is surfaced. An unknown on EITHER side reads as quiet, never as drift —
lighting every host amber on rollout day is how a warning becomes background noise. The
delivery channel itself stays R-50b(b)/(c).

Compatibility unchanged: safe for 0.90.0 agents (unknown JSON key dropped); the re-arm
and auth-honesty guarantees need agent >=0.91.0, so MinAgent moves only after the fleet
has self-updated.

Tests: auth_failed escalate/debounce/recovery-forgets-streak; honesty gauge incl. grace
window, the restage edge (consumed_at deliberately NULLed), consumed-never-alarms, and
honest-stuck-no-double-report; wrapper drift incl. both unknown directions. Red-proof run
at the assertion level: removing the auth_failed arm fails the escalation tests with
reissues=0.

hub/internal/web/templates/host_detail_body.html

@@ -22,6 +22,17 @@
                     <span class="label">Agent Version</span>
                     <span class="value">{{if .AgentVersion}}<code>{{.AgentVersion}}</code>{{else}}—{{end}}</span>
                 </div>
+                {{if .WrapperDrift}}
+                <div class="info-item">
+                    <span class="label">PBS wrapper</span>
+                    {{if eq .WrapperDrift "ok"}}
+                    <span class="value">matches vouched <code>{{slice .ReportedWrapperSHA 0 12}}…</code></span>
+                    {{else}}
+                    <span class="value" style="color: var(--yellow)">DRIFT — installed <code>{{slice .ReportedWrapperSHA 0 12}}…</code>, vouched <code>{{slice .VouchedWrapperSHA 0 12}}…</code><br>
+                        <span style="font-size:.85em">/usr/local/sbin/felhom-pbs-apply differs from the manifest. It is delivered unversioned from <code>main</code> (R-50b), so this host may be running privileged code from a different commit.</span></span>
+                    {{end}}
+                </div>
+                {{end}}
                 <div class="info-item">
                     <span class="label">Enrolled</span>
                     <span class="value">{{timeAgo .CreatedAt}}</span>