feat(app): add createClientEffect for zero-boilerplate OpenAPI usage (#6)

* Initial commit with task details

Adding CLAUDE.md with task information for AI processing.
This file will be removed when the task is complete.

Issue: #5

* feat(app): add createClientEffect with universal dispatcher for zero-boilerplate API usage

- Add createUniversalDispatcher that classifies responses by HTTP status range
  (2xx → success channel, non-2xx → error channel) without code generation
- Add createClientEffect<Paths>(options) — zero-boilerplate Effect-based API client
  that works with any OpenAPI schema without generated dispatchers or registry setup
- Export new APIs through shell/api-client/index.ts

This enables the user's desired DSL:
  const apiClientEffect = createClientEffect<paths>(clientOptions)
  apiClientEffect.POST("/api/auth/login", { body: credentials })

INVARIANT: ∀ path, method: path ∈ PathsForMethod<Paths, method> (compile-time)
INVARIANT: ∀ status ∈ [200..299]: success channel; otherwise: error channel (runtime)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat(tests): add runtime and type-level tests for createClientEffect with auth schema

- 10 runtime tests: POST /api/auth/login (200, 400, 401, 500),
  POST /api/auth/logout (204), GET /api/auth/me (200, 401),
  POST /api/register (201, 409), UnexpectedContentType boundary error
- 23 type-level tests: PathsForMethod constraints, literal status preservation,
  HttpError status unions, ApiFailure union members, RequestOptionsFor body constraints

Total tests: 69 → 102 (all passing)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Revert "Initial commit with task details"

This reverts commit ab9bf8c.

* fix(lint): exclude generated openapi.d.ts from lint rules that conflict with openapi-typescript output

- Add ESLint override for openapi.d.ts: disable sonarjs/class-name and max-lines
  (openapi-typescript generates lowercase interface names per OpenAPI spec convention)
- Add openapi.d.ts to jscpd ignore list (generated types have structural repetition by design)
- Auto-formatted openapi.d.ts by ESLint dprint (semicolons → ASI, tabs → spaces)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat(app): export createClientEffect from package entry point and add CI integration test

- Export createClientEffect and createUniversalDispatcher from src/index.ts
  so `import { createClientEffect, type ClientOptions } from "openapi-effect"` works
- Add integration test verifying the exact user DSL snippet from issue #5:
  createClientEffect<paths>(options).POST("/api/auth/login", { body: credentials })
- 5 new tests: POST with body, yield* pattern, error handling, GET, 204 no-content

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: codex-ci <codex-ci@users.noreply.github.com>

Author: 3 people

packages/app/.jscpd.json

@@ -13,7 +13,7 @@
 		"**/tests/api-client/**",
 		"**/src/shell/api-client/create-client.ts",
 		"**/src/index.ts",
-    "**/src/core/api/openapi.d.ts"
+		"**/src/core/api/openapi.d.ts"
 	],
 	"skipComments": true,
 	"ignorePattern": [