feat: add Security division (resolves RFC #438)

Creates the 15th division, security/, consolidating the security-focused
agents that were proposed across PRs #223, #326, #383 and scattered in
other divisions. Implements the consensus from RFC #438.

New agents (6):
- Application Security Engineer, Cloud Security Architect, Incident
  Responder, Penetration Tester, Threat Intelligence Analyst (from #223)
- Senior SecOps Engineer (from #326)

Relocated into security/ (4):
- engineering-security-engineer -> security-architect (differentiated to
  architecture/threat-modeling; code-level work hands off to AppSec)
- engineering-threat-detection-engineer
- specialized/compliance-auditor
- specialized/blockchain-security-auditor

Wiring: security added to AGENT_DIRS (convert/install/lint) + the CI
workflow paths/diff filter; README gains a Security Division section and
the relocated rows are removed from their old tables; CONTRIBUTING lists
the new category. Counts updated to 209 agents / 15 divisions. #223's
stray .claude/settings.local.json is not included.

All 10 pass lint + the originality check; convert generates all 209 cleanly.

Closes #223, #326.

Co-Authored-By: anonym88-ai <anonym88-ai@users.noreply.github.com>
Co-Authored-By: caveat-ops <caveat-ops@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

scripts/convert.sh

@@ -64,7 +64,7 @@ TODAY="$(date +%Y-%m-%d)"
 
 AGENT_DIRS=(
   academic design engineering finance game-development marketing paid-media product project-management
-  sales spatial-computing specialized strategy support testing
+  sales security spatial-computing specialized strategy support testing
 )
 
 # --- Usage ---

scripts/install.sh

@@ -107,7 +107,7 @@ ALL_TOOLS=(claude-code copilot antigravity gemini-cli opencode openclaw cursor a
 # Standard agent category directories (keep sorted, sync with convert.sh / lint-agents.sh)
 AGENT_DIRS=(
   academic design engineering finance game-development marketing paid-media product project-management
-  sales spatial-computing specialized strategy support testing
+  sales security spatial-computing specialized strategy support testing
 )
 
 # ---------------------------------------------------------------------------

scripts/lint-agents.sh

@@ -22,6 +22,7 @@ AGENT_DIRS=(
   product
   project-management
   sales
+  security
   spatial-computing
   specialized
   support