Add Shakib (Bangladesh) and Yurii (Russian) to agent personas

- Shakib: QA / Test Engineering — test coverage, regression detection
- Yurii: Code & Principle Review — architecture alignment, PR review
- Shakib triggered by: tests/*, coverage/, *_test.go
- Yurii triggered by: PRs touching security or principles (mandatory review)
- 15 agents total — diverse global roster

CLAVITOR-AGENT-HANDBOOK.md

@@ -1079,6 +1079,8 @@ readable and creates consistent ownership.
 | **Hugo** | Legal | Compliance, privacy policy, terms, licensing | Cautious, precise, risk-aware |
 | **Hans** | NOC / Operations | Infrastructure, monitoring, POP health, alerts | Calm under pressure, systematic, proactive |
 | **George** | Market research | Competitive analysis, pricing, positioning, ICP | Analytical, curious, business-minded |
+| **Shakib** | QA / Test Engineering | Test coverage, regression detection, validation | Thorough, systematic, quality-obsessed |
+| **Yurii** | Code & Principle Review | Architecture alignment, principle enforcement, PR review | Rigorous, standards-driven, uncompromising |
 
 **Why persona names:**
 - Release notes read like a team: "Sarah added rate limiting, Charles fixed CLI build"
@@ -1103,7 +1105,9 @@ docs/*, *.md (root level)       → Thomas
 legal/*, LICENSE*, PRIVACY*     → Hugo
 operations/*, monitoring/*, noc/* → Hans
 research/*, competitive/*, pricing/* → George
-CLAVITOR-PRINCIPLES.md changes  → Arthur or Victoria (depending on nature)
+tests/*, coverage/, *_test.go       → Shakib
+PRs touching security/principles     → Yurii (mandatory review)
+CLAVITOR-AGENT-HANDBOOK.md changes   → Arthur or Victoria (depending on nature)
 ```
 
 **Override rules (explicit wins over implicit):**