feat: add buildRaw() to WasapiClient.Builder

[Umutayb]

Summary

• Adds buildRaw() method to WasapiClient.Builder that returns a raw WasapiClient instance
• Enables direct execute() calls without needing a decorated API class
• Used by @civitas-cerebrum/singularity Steps API for generic HTTP methods

Why

The existing build(ApiClass) requires a decorated class with @GET/@POST methods. For singularity's steps.apiGet('/path') pattern, we need a raw client that can call execute() with arbitrary method/path/body.

Test plan

• TypeScript compiles clean
• Existing tests pass
• Publish as 0.0.1 after merge

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[github-actions]

📊 API Coverage Report

Build Passed: 100% API Coverage!

🔍 View Detailed Coverage Breakdown

ApiCall: 6/6
[x] clone
[x] perform
[x] getResponse
[x] getResponsePair
[x] monitorResponseCode
[x] monitorFieldValue

ApiResponse: 3/3
[x] isSuccessful
[x] errorBody
[x] fromFetch

ResponsePair: 1/1
[x] isError

WasapiClient: 2/2
[x] execute
[x] build

_{Plain report generated by @civitas-cerebrum/test-coverage · 2026-04-06}