chore: migrate organization identity to paperkeel

[slate-rehm]

Summary

• Move GitHub references, package scopes, and automation ownership from bearfire-dev to paperkeel.
• Set the Sentry organization to paperkeel where this repository configures it.
• Keep existing product, domain, and deployment names.

Verification

• Ran git diff --check.
• Ran the repository checks that apply to the changed files. Required CI remains the merge gate.

[slate-rehm]

#AI-Automation

Updated the repository identity to paperkeel. Local checks and git diff --check passed for the changed files; required CI remains the merge gate.

[coderabbitai]

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Review configuration:

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 6c0e2afd-3fe6-4e2c-a911-9e456bb498d3

📥 Commits

Reviewing files that changed from the base of the PR and between 14f1590 and 5742635.

📒 Files selected for processing (5)

• README.md
• src/components/site-header-constants.ts
• src/lib/hunt-constants.ts
• src/lib/sentry/constants.ts
• stacks/github.ts

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