Add batch operation support to MCP server

[titouanmathis]

Implements #68 — adds a batch resource with run action to execute multiple read operations in parallel.

Changes

Core

• Added batch to RESOURCES constant

MCP

• New handleBatch() handler with validation (max 10 ops, read-only, required fields)
• Parallel execution via Promise.allSettled with per-operation error isolation
• _batch summary with total/succeeded/failed counts
• Added operations parameter to forge tool input schema
• Updated help and schema handlers for batch resource
• Comprehensive test coverage

Usage

{
  "resource": "batch",
  "action": "run",
  "operations": [
    { "resource": "servers", "action": "list" },
    { "resource": "sites", "action": "list", "server_id": "123" },
    { "resource": "databases", "action": "list", "server_id": "123" }
  ]
}

Closes #68

[codecov]

Codecov Report

❌ Patch coverage is 98.24561% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.80%. Comparing base (d3c0f6f) to head (76d53fb).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
packages/mcp/src/handlers/batch.ts	97.87%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #73      +/-   ##
==========================================
- Coverage   99.82%   99.80%   -0.03%     
==========================================
  Files         218      219       +1     
  Lines        3462     3519      +57     
  Branches      799      827      +28     
==========================================
+ Hits         3456     3512      +56     
- Misses          6        7       +1     

Flag	Coverage Δ
unittests	99.80% <98.24%> (-0.03%)	⬇️

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