Extract core MCP registry tools

[w1ne]

Summary

• Extract remaining core/runtime, inspection/verification, and reference/export MCP entries into registry modules.
• Leave toolRegistry.ts as composition, metadata, and dispatch boundary only.
• Add public-contract coverage for group composition and moved-handler dispatch wiring.

Verification

• npm test -- src/agent/mcp/toolRegistry.publicContract.test.ts src/agent/mcp/toolNameConsistency.test.ts src/agent/mcp/server.test.ts tests/unit/mcp/toolRegistrySchema.test.ts tests/unit/mcp/server.test.ts tests/integration/mcp/serverToolDispatch.test.ts src/agent/mcp/tools/inspect.test.ts src/agent/mcp/tools/verify.test.ts src/agent/mcp/tools/query.test.ts src/agent/mcp/tools/export.test.ts
• npm run typecheck
• npx eslint src/agent/mcp/toolRegistry.ts src/agent/mcp/registry/coreRuntimeTools.ts src/agent/mcp/registry/inspectionVerificationTools.ts src/agent/mcp/registry/referenceExportTools.ts src/agent/mcp/toolRegistry.publicContract.test.ts
• git diff --check origin/develop..HEAD

Review

• Subagent spec/order review: no findings.
• Subagent code-quality review: handler-wiring coverage and non-contiguous-group clarity findings fixed; re-review no findings.

No docs touched.