refactor: rename Axonel to Sentinel

[roonakyadav]

Renames the product and user-facing CLI from Axonel to Sentinel across the repository.

Migration is intentionally split into focused commits:

1. server/workspace identity and CLI binary
2. provider/runtime test identities
3. server/integration test fixtures
   4-7. web UI branding
   8-9. web browser/validation tests
4. checked-in production web assets
5. top-level project documentation
6. core product documentation
7. operational/architecture documentation
8. validation and release documentation

The GitHub organization remains axonel, and the axonel.dev organizational domain is intentionally preserved. The repository slug is still axonel/axonel because the connected GitHub interface does not expose the repository-settings rename operation.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve the actual GitHub owner and slug

The commit description explicitly says the repository remains axonel/axonel, but this new default sends any live POST /api/v1/github/pulls request that omits the optional repo field to sentinel/sentinel, which will receive a GitHub 404 rather than create the PR. The same incorrect remote rename also appears in the package metadata and quickstart URLs, so retain axonel/axonel until the GitHub repository settings are actually renamed.

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