feat(ai): integrate Fireworks adapter

[Photon101]

Summary

• replace the Fireworks AI stub with a working OpenAI-compatible chat completions implementation
• use Fireworks' documented OpenAI-compatible base URL, https://api.fireworks.ai/inference/v1
• preserve dry-run behavior, map usage tokens, pass provider-specific options through opts.extra, and surface concise HTTP error excerpts
• cover request shape, dry-run short-circuiting, and error handling with focused Vitest tests

This implements another AI provider adapter for #6.

Notes

Fireworks documents OpenAI compatibility for chat completions at /chat/completions under the https://api.fireworks.ai/inference/v1 base URL. The adapter keeps baseUrl override support for custom deployments.

Validation

• git diff --check
• corepack pnpm exec vitest run packages/ai/fireworks/src/index.test.ts
• corepack pnpm exec tsc -p packages/ai/fireworks/tsconfig.json --noEmit

The full workspace install remains blocked by the unrelated packages/dns/azure dependency on missing workspace package @sh1pt/core; this package was validated with root dev tooling and a local link to packages/core.

[github-actions]

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[github-actions]

🤖 Auto-rebase: The branch was rebased successfully locally but could not be pushed to the fork. Please enable 'Allow edits from maintainers' in the PR settings, or rebase manually: git fetch upstream master && git rebase upstream/master.

[github-actions]

🤖 Auto-rebase: The branch was rebased successfully locally but could not be pushed to the fork. Please enable 'Allow edits from maintainers' in the PR settings, or rebase manually: git fetch upstream master && git rebase upstream/master.

[github-actions]

🤖 Auto-rebase: The branch was rebased successfully locally but could not be pushed to the fork. Please enable 'Allow edits from maintainers' in the PR settings, or rebase manually: git fetch upstream master && git rebase upstream/master.