Implement Amazon Bedrock AI adapter

[op-simoneromeo]

Summary

• replace the Amazon Bedrock AI stub with a signed Bedrock Runtime Converse adapter
• add AWS SigV4 request signing, region/base URL config, optional session-token support, and setup prompts for access key + secret key
• map Converse text output and usage tokens back into the sh1pt AI result shape

Validation

• pnpm vitest run packages/ai/amazon-bedrock/src/index.test.ts
• pnpm --filter @profullstack/sh1pt-ai-amazon-bedrock typecheck
• pnpm --filter @profullstack/sh1pt-ai-amazon-bedrock build
• git diff --check
• secret-pattern scan over packages/ai/amazon-bedrock/src returned no matches

Docs

• Bedrock Converse API: https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_Converse.html
• AWS SigV4: https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_sigv.html

No real AWS credentials or other secrets are included; tests use placeholder AWS documentation-style values only.

[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.