docs: reconcile scheduler topology across sibling docs (7 → 12 loops)

Authoritative 12-loop table lives at docs/architecture.md:522-534 (committed via
the I-001/I-003/I-005 + M48/M50 milestone commits). This change brings six sibling
docs into parity with that table so every surface — user-facing features reference,
SOC 2 compliance mapping, connectors guide, advanced demo architecture diagram,
testing guide, and in-line architecture prose — reflects the same 8 always-on + 4
opt-in topology.

Touches:
- docs/architecture.md: 2 inline ordinal references (9th / 8th loop) replaced with
  descriptive names (opt-in cloud discovery / opt-in endpoint health), cross-linked
  to the authoritative table to prevent future ordinal rot.
- docs/features.md: metric row (7 → 12), inline reference to 9th loop, and full
  scheduler table expanded to include Always-on column + env vars + I-001/I-003/I-005
  refs.
- docs/compliance-soc2.md: background scheduler monitoring bullets expanded to list
  all 12 loops with env vars + I-series refs; table row updated with 8 always-on +
  4 opt-in summary.
- docs/connectors.md: three inline ordinals (7th/6th/9th loop) replaced with
  descriptive names, cross-linked to architecture.md.
- docs/demo-advanced.md: Mermaid SCHED node label updated from '7 background loops'
  to '12 background loops (8 always-on + 4 opt-in)'.
- docs/testing-guide.md: Test 20.1.1 header + grep pattern expanded to include
  job-retry / job-timeout / notification-retry / digest / endpoint-health /
  cloud-discovery loops; sign-off chart row label updated.

Pure documentation reconciliation. No code changes. Master HEAD pre-commit: 6e646e0.

docs/testing-guide.md

@@ -5002,10 +5002,10 @@ curl -s -w "HTTP %{http_code}\n" -X DELETE -H "$AUTH" "$SERVER/api/v1/audit/$EVE
 
 > **Tip:** Open a second terminal with `docker compose logs -f certctl-server` to watch scheduler log output in real time.
 
-**Test 20.1.1 — Scheduler startup: all 7 loops registered**
+**Test 20.1.1 — Scheduler startup: all 12 loops registered**
 
 ```bash
-docker compose logs certctl-server 2>&1 | grep -i "scheduler\|renewal check\|job processor\|health check\|notification\|short-lived\|network scan" | head -20
+docker compose logs certctl-server 2>&1 | grep -i "scheduler\|renewal check\|job processor\|job retry\|job timeout\|health check\|notification\|notification retry\|short-lived\|network scan\|digest\|endpoint health\|cloud discovery" | head -30
 ```
 
 **What:** Checks server startup logs for scheduler loop registration.
@@ -7340,7 +7340,7 @@ These must be green before starting manual QA:
 
 | Test | Description | Method | Pass? | Date | Notes |
 |------|-------------|--------|-------|------|-------|
-| 20.1.1 | Scheduler startup: all 7 loops registered | Manual | ☐ |  |  |
+| 20.1.1 | Scheduler startup: all 12 loops registered | Manual | ☐ |  |  |
 | 20.1.2 | Job processor loop fires (30s interval) | Manual | ☐ |  |  |
 | 20.1.3 | Agent health check marks offline (2m interval) | Manual | ☐ |  |  |
 | 20.1.4 | Notification processor fires (1m interval) | Manual | ☐ |  |  |