Implement Perceptron AI adapter

[op-simoneromeo]

Summary

• replace the Perceptron AI stub with a real chat-completions adapter for https://api.perceptron.inc/v1/chat/completions
• use PERCEPTRON_API_KEY, documented Perceptron/Isaac model ids, dry-run behavior, system/user messages, max_completion_tokens, temperature, and extra request passthrough for response_format / vision_config / other Perceptron options
• map non-streaming response text and usage tokens, support custom baseUrl, and return concise provider error excerpts

Validation

• pnpm vitest run packages/ai/perceptron/src/index.test.ts
• pnpm --filter @profullstack/sh1pt-ai-perceptron typecheck
• pnpm --filter @profullstack/sh1pt-ai-perceptron build
• git diff --check
• rg common secret-pattern scan over packages/ai/perceptron

No real Perceptron API key or other secret was used.

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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.

[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.