feat(client): allow callers to supply a correlation ID on send()

[patoperpetua]

Summary

• Add optional correlationId on PostKitClient.send() and as a client-level default; sent as x-correlation-id when provided.
• Validate correlation IDs client-side (8–128 alphanumeric / hyphen / underscore) and reject invalid values with PostKitRequestError code INVALID_CORRELATION_ID before any network call.
• Surface the server correlation id on success (SendResponse.id) and on errors (PostKitRequestError.correlationId, including X-Correlation-Id header fallback).
• Update packages/post-kit-client/README.md and docs/guides/api-quickstart.md to document the option and remove the raw-HTTP workaround.

Test plan

• pnpm -C packages/post-kit-client test — supplied, omitted, invalid, client default, per-request override, error header fallback
• pnpm -r --if-present run test — full workspace suite passes

Closes #66

Made with Cursor

Summary by CodeRabbit

• New Features

  • Added optional correlation IDs for clients and individual requests.
  • Correlation IDs are included in requests when provided, with per-request values overriding client defaults.
  • Relevant HTTP errors can now expose correlation IDs from response data or headers.

• Bug Fixes

  • Invalid correlation IDs are rejected before network requests with a clear error code.

• Documentation

  • Added guidance on configuration, validation, precedence, tracing, and error handling.

[coderabbitai]

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Reviewing files that changed from the base of the PR and between 710b515 and fff0cbd.

📒 Files selected for processing (1)

• docs/guides/api-quickstart.md

🚧 Files skipped from review as they are similar to previous changes (1)

• docs/guides/api-quickstart.md

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📝 Walkthrough

Walkthrough

The client now accepts client-level and per-request correlation IDs. It validates IDs before network calls, sends valid IDs in request headers, returns server IDs on success and HTTP failure paths, and documents conditional correlation ID availability.

Changes

Correlation ID support

Layer / File(s)	Summary
Correlation ID contract and validation packages/post-kit-client/src/correlation.ts, packages/post-kit-client/src/errors.ts, packages/post-kit-client/src/client.ts	The client exposes correlation ID options. The validator accepts 8–128 character alphanumeric, hyphen, or underscore values. Invalid values use INVALID_CORRELATION_ID.
Request and error correlation flow packages/post-kit-client/src/client.ts, packages/post-kit-client/src/client.spec.ts	Per-request IDs override client defaults and are sent as x-correlation-id. Tests cover omitted IDs, defaults, precedence, validation, success responses, and error-header fallback.
Usage and error documentation packages/post-kit-client/README.md, docs/guides/api-quickstart.md	Documentation covers correlation ID configuration, propagation, validation, returned IDs, HTTP error handling, and conditional support logging.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to fff0c

The client now supports validated correlation IDs and surfaces them in responses and errors; no actionable merge-blocking risk remains after normal checks and review.

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant PostKitClient
  participant PostKitAPI
  Caller->>PostKitClient: send(request, options)
  PostKitClient->>PostKitAPI: Send request with x-correlation-id
  PostKitAPI-->>PostKitClient: Success or HTTP error with X-Correlation-Id
  PostKitClient-->>Caller: SendResponse or PostKitRequestError

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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 4 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the primary change: allowing callers to supply a correlation ID through client send operations.
Description check	✅ Passed	The description explains the behavior, affected package, linked issue, and test commands. It omits the template's dedicated Feedback focus section and detailed setup and expected-result steps, but it …
Linked Issues check	✅ Passed	The changes satisfy issue #66: they add per-request and client-level correlation IDs, send and validate the header before network access, expose server IDs on success and HTTP errors, preserve omissio…
Out of Scope Changes check	✅ Passed	The implementation, tests, error type update, and documentation changes are directly related to correlation ID support described in issue #66. No unrelated code changes are identified.

Full details: Description check

Explanation

The description explains the behavior, affected package, linked issue, and test commands. It omits the template's dedicated Feedback focus section and detailed setup and expected-result steps, but it is mostly complete and remains relevant.

Full details: Linked Issues check

Explanation

The changes satisfy issue #66: they add per-request and client-level correlation IDs, send and validate the header before network access, expose server IDs on success and HTTP errors, preserve omission behavior, update both documents, and add focused tests.

Full details: Docstring Coverage

Explanation

Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 4 files. (1 skipped: 1 unsupported.)

• Fix all pre-merge checks with AI

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/66-correlation-id

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[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@docs/guides/api-quickstart.md`:
- Around line 139-142: Update the correlation ID documentation around
PostKitRequestError.correlationId to limit its guarantee to HTTP error
responses: state that it is populated only when the response body or
X-Correlation-Id header provides the server ID, and clarify that invalid IDs,
timeouts, and network errors may leave it undefined.

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Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: e3cce926-bb12-4d69-b44c-1fdb1a2e4ae7

📥 Commits

Reviewing files that changed from the base of the PR and between 1e667ae and 710b515.

📒 Files selected for processing (6)

• docs/guides/api-quickstart.md
• packages/post-kit-client/README.md
• packages/post-kit-client/src/client.spec.ts
• packages/post-kit-client/src/client.ts
• packages/post-kit-client/src/correlation.ts
• packages/post-kit-client/src/errors.ts

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