ci: post-Phase-2-docs-overhaul cleanup of stale guards + missing config doc

CI run on the ecb8896 push surfaced two real failures rooted in the
2026-05-04 docs overhaul:

  1. G-3 env-docs-drift caught two phantom CERTCTL_* env vars I'd
     introduced in the Phase 4 follow-on connector pages
     (CERTCTL_CA_CERT_PATH_NEW in adcs.md was a placeholder I made
     up; CERTCTL_EJBCA_POLL_MAX_WAIT_SECONDS in ejbca.md does not
     exist in source). Both removed.

  2. QA-doc Part-count drift guard tried to grep
     docs/qa-test-guide.md and docs/testing-guide.md, both of which
     were renamed/deleted in Phase 2/Phase 5. The Part-count drift
     class died with testing-guide.md (Phase 5 prune dispersed its
     content); the seed-count drift class is still live but pointed
     at the wrong path.

Fixes:

- Removed the QA-doc Part-count drift guard from ci.yml (premise
  dead) plus its standalone scripts/qa-doc-part-count.sh peer.
- Retargeted the QA-doc seed-count drift guard from
  docs/qa-test-guide.md → docs/contributor/qa-test-suite.md (the
  Phase 2 target). Updated both ci.yml inline copy and
  scripts/qa-doc-seed-count.sh.
- Updated Makefile qa-stats: target to drop the testing-guide.md
  Parts metric (file is gone).
- Updated Makefile verify-docs: target to drop the part-count step.

G-3 was also failing in the second direction (env vars defined in
config.go but never documented anywhere). 16 vars surfaced —
features.md (deleted Phase 6) and testing-guide.md (deleted Phase 5)
had been their canonical home. Created
docs/reference/configuration.md as the new home: a compact
operator-facing env-var reference covering scheduler intervals, job
lifecycle, rate limiting, audit, deploy verify, database,
agent-side, and SCEP profile binding. Added to docs/README.md
Reference table.

Doc-side updates to qa-test-suite.md to reframe its references to
the deleted testing-guide.md (it's now self-contained: the
Part-by-Part Coverage Map IS the canonical Part inventory).

Cosmetic comment-only updates in ci.yml + scripts/ci-guards/*.sh +
scripts/dev-setup.sh to point at the new audience-organized doc
paths (docs/operator/security.md, docs/operator/tls.md,
docs/reference/architecture.md, etc.) instead of the pre-Phase-2
flat layout.

Verified: all 24 ci-guards/*.sh pass locally; qa-doc-seed-count.sh
clean. Net diff: 178 additions / 112 deletions across 13 files.
One file deleted (qa-doc-part-count.sh) and one file added
(docs/reference/configuration.md).

scripts/dev-setup.sh

@@ -135,7 +135,7 @@ echo "  3. Test the API:"
 echo "     curl --cacert ./deploy/test/certs/ca.crt https://localhost:8443/health"
 echo ""
 echo "  4. Try the quick start guide:"
-echo "     cat docs/quickstart.md"
+echo "     cat docs/getting-started/quickstart.md"
 echo ""
 echo "  5. Access PgAdmin (optional):"
 echo "     make docker-up-dev"
@@ -150,6 +150,6 @@ echo "  make docker-logs   - View service logs"
 echo ""
 echo "For more information, see:"
 echo "  • README.md"
-echo "  • docs/architecture.md"
-echo "  • docs/quickstart.md"
+echo "  • docs/reference/architecture.md"
+echo "  • docs/getting-started/quickstart.md"
 echo ""