M9: MCP Hub locale/correlation propagation, real Hub health check, fix stale test image

Fixed two concrete gaps in the MCP knowledge-search endpoint: no locale field
existed at all (now nl-BE/en-GB/fr-BE, wired to the knowledge provider's
existing language param), and the correlation ID was always freshly minted,
ignoring any inbound X-Correlation-Id header. Added a shared dependency and
applied it to all four MCP endpoints so Fleet Ops's own audit log preserves
the Hub's real correlation ID end to end.

MCP_HUB_BASE_URL/MCP_PROVIDER_ID were declared in .env.example but never read
anywhere. Since the Hub's own registration is catalog-driven (it never needs
Fleet Ops to push a registration call), wired mcp_hub_base_url for a real Hub
reachability health check instead of an unneeded self-registration call.

Renamed Fleet Ops's own internal audit tool labels mobilityops_* -> fleet_ops_*
(mirrored in contracts/mcp-tools.json with mobilityops_* kept as deprecated
aliases); documented that the live Hub connector's own dotted tool namespace
is a separate, Hub-owned naming layer, deliberately not touched.

Automation page's MCP card now shows real evidence (last tool/client/count/
timestamp, honest no-evidence state) instead of just the registration flag.

Also fixed a real methodology gap found mid-session: compose.yaml's api
service has no bind mount, so `docker compose run --rm api` silently tests a
stale image until rebuilt. Re-ran every local gate after rebuilding; fixed one
genuinely stale test assertion and two lint line-length errors surfaced by
that rebuild. 176 tests passing, ruff clean, mypy clean (50 files).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/src/styles.css

@@ -337,7 +337,9 @@ details summary { cursor: pointer; color: var(--teal-dark); }.data-table details
 .resolution-actions .button-tertiary:hover { color: var(--ink); background: var(--surface); border-color: var(--line); }
 .resolution-actions .button-tertiary-destructive:hover { color: var(--critical); background: var(--surface); border-color: var(--line); }
 
-.integration-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 28px; }.integration-cards article { min-height: 170px; display: grid; grid-template-columns: auto 1fr; gap: 12px; padding: 18px; background: white; border: 1px solid var(--line); border-radius: var(--radius); }.integration-cards .badge { grid-column: 1 / -1; width: max-content; align-self: end; }.integration-cards h2 { margin: 3px 0 7px; font-size: .95rem; }.integration-cards p { margin: 0; color: var(--muted); font-size: .7rem; line-height: 1.48; }.integration-kicker { color: var(--muted); font-size: .56rem; font-weight: 700; text-transform: uppercase; letter-spacing: .09em; }
+.integration-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 28px; }.integration-cards article { min-height: 170px; display: grid; grid-template-columns: auto 1fr; gap: 12px; padding: 18px; background: white; border: 1px solid var(--line); border-radius: var(--radius); }.integration-cards .badge { grid-column: 1 / -1; width: max-content; align-self: end; }
+.integration-cards .integration-badge-stack { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 6px; align-self: end; }
+.integration-cards small { display: block; margin-top: 4px; color: var(--muted-light); font-size: .6rem; }.integration-cards h2 { margin: 3px 0 7px; font-size: .95rem; }.integration-cards p { margin: 0; color: var(--muted); font-size: .7rem; line-height: 1.48; }.integration-kicker { color: var(--muted); font-size: .56rem; font-weight: 700; text-transform: uppercase; letter-spacing: .09em; }
 
 .scenario-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 14px; }
 .scenario-card { display: flex; flex-direction: column; gap: 10px; padding: 18px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }