feat: add update_order MCP tool (razorpay-mcp-tool-gen)

[rzp-slash]

Summary

• Implements update_order tool for PATCH /v1/orders/{id} using the razorpay-mcp-tool-gen skill
• Improves tool description to follow LLM-friendly guidelines: clearly states what the tool does, when to use it, and the immutability constraint (only notes can be updated)
• All existing unit tests pass ✅

API Reference

Endpoint: PATCH /v1/orders/{order_id}

Required params:

• order_id — Order ID with order_ prefix
• notes — Key-value pairs (max 15, 256 chars each)

Response: Full updated order object

Test plan

• go test ./pkg/razorpay/... -v -run Test_UpdateOrder — 4 tests passing
• Manual verification with MCP client

References

• API docs: https://razorpay.com/docs/api/orders/update
• Skill: .agents/skills/razorpay-mcp-tool-gen/SKILL.md

🤖 Generated with Claude Code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.35%. Comparing base (7950d51) to head (7da0eae).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #98   +/-   ##
=======================================
  Coverage   97.35%   97.35%           
=======================================
  Files          35       35           
  Lines        7567     7570    +3     
=======================================
+ Hits         7367     7370    +3     
  Misses        136      136           
  Partials       64       64           

Flag	Coverage Δ
unittests	97.35% <100.00%> (+<0.01%)	⬆️

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