BucketGit v1.0.0 - Full serverless Git stack, test suite and webUI

[dennisvink]

Breaking changes

• BucketGit is now broker-first. Normal repository operations go through a
  broker-backed repo model by default; legacy direct bucket and cloud IAM flows
  moved under bgit direct.
• bgit admin now manages broker-backed repository users, keys, protection,
  issues, visibility, and danger-zone repository controls instead of cloud IAM.
• Repository setup and selection now use broker profiles from
  ~/.bgit/config.yaml, including region-qualified profiles.

Added

• Broker-first setup and repository initialization, including cloud profile
  discovery, owner SSH key import, multi-region broker provisioning, and
  ~/.bgit/config.yaml.
• Broker-issued object-transfer capabilities, logical repo mapping, roles,
  branch protection, pull requests, issues, and GitHub SSH key import.
• Repository visibility, read-only mode, logical rename, destructive owner-only
  delete controls, owner transfer, member invites, and repo-scoped invite
  cancellation.
• bgit web as a broker-aware repository browser with embedded assets,
  pull-request review flows, issues, settings, capability-aware controls, and
  local/remote state indicators.
• bgit direct as the explicit low-level object-storage and cloud IAM recovery
  path.
• Local broker integration test mode for GCP and AWS runtimes, with coverage for
  roles, branch protection, PRs, issues, native Git transport, public/private
  access, identity selection, and danger-zone controls.

Changed

• Push/fetch/read paths use the broker by default, with region-qualified
  profiles and --profile NAME --region REGION disambiguation.
• Setup is more guided for GCP/AWS onboarding, project/billing/API checks, and
  interactive profile, region, and SSH key selection.
• BucketGit identity is configurable globally or per repo, with a clear prompt
  before pushing with the default client identity.