[dajiaohuang]

Summary

• Apply the client context centrally before sending requests, so GET, PUT, POST, multipart POST, and DELETE honor cancellation and deadlines.
• Replace TestWithContext's default-transport round trip with an in-memory synthetic response, and cover cancellation for every request method.

Validation

• Go 1.21.13: go test -count=1 -run '^(TestWithContext|TestHTTPMethodsHonorClientContext)$' .
• go build ./...
• go vet ./...
• gofmt on changed Go files and git diff --check

The full repository test suite was not run locally under the synthetic-only test boundary. No Trello API, account, credentials, board data, or real HTTP service was used.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.08%. Comparing base (dab0f63) to head (74853ea).
⚠️ Report is 35 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #101      +/-   ##
==========================================
+ Coverage   73.51%   74.08%   +0.57%     
==========================================
  Files          22       22              
  Lines         857     1092     +235     
==========================================
+ Hits          630      809     +179     
- Misses        195      240      +45     
- Partials       32       43      +11     

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