fix(http): avoid retrying keyless writes (#103)

[naufalfx805-source]

What does this PR do?

Closes #103.

This gates transport-level retries so non-idempotent writes without an Idempotency-Key are not blindly replayed after a network error or bare edge 408/502/504 response.

Changes:

• Allows transport retries for GET/HEAD requests.
• Allows transport retries for writes only when an Idempotency-Key header is present, case-insensitively.
• Leaves API-envelope retry behavior unchanged.
• Adds regression tests for keyless POST vs idempotency-key POST on both thrown transport errors and bare 502 edge responses.

Verification

• npm test -- src/lib/http.test.ts -> 45 passed
• npm run lint
• npm run typecheck
• npm run build
• git diff --check

Summary by CodeRabbit

• Bug Fixes
  • Improved retry handling for network failures and transient gateway responses.
  • Prevented automatic retries for non-idempotent requests unless an idempotency key is provided.
  • Continued supporting retries for safe requests and idempotent-keyed writes.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 60d55e4 and 674e8e2.

📒 Files selected for processing (2)

• src/lib/http.test.ts
• src/lib/http.ts

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Walkthrough

HttpClient now limits transport retries to idempotent methods or requests with an idempotency key. Tests cover keyless and keyed POST requests for thrown fetch errors and transport-edge responses.

Changes

Transport retry policy

Layer / File(s)	Summary
Retry eligibility and transport-path gating src/lib/http.ts	Transport retries are allowed for GET/HEAD requests or requests containing an idempotency-key header, and are suppressed for other requests in both transport failure paths.
Write retry behavior tests src/lib/http.test.ts	POST tests verify that keyless writes are not retried while idempotency-key writes retry for fetch errors and 502-like transport-edge responses.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Suggested reviewers: ruili-testsprite, zeshi-du

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title is concise and accurately summarizes the key change: preventing retries of keyless writes.
Linked Issues check	✅ Passed	The code and tests match #103 by blocking transport retries for keyless writes while preserving retries for GET/HEAD and keyed writes.
Out of Scope Changes check	✅ Passed	The changes stay focused on HTTP retry behavior and regression tests, with no obvious unrelated additions.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

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• Create PR with unit tests

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