fix(ci): rebuild packages after version bump and add jbcom branding

[jbdevprimary]

Summary

Critical fixes for CI/CD release workflow and documentation branding required for 1.0 stable release.

Changes

CI/CD Fix

• Problem: Release workflow was downloading pre-built packages from build job, causing version mismatch
  • semantic-release would bump version to 5.3.1
  • But downloaded artifacts contained 5.3.0 packages
  • Result: PyPI publish failures with 403 authentication errors
• Solution: Build packages AFTER version bump instead of downloading old artifacts
  • Ensures published packages match the released version
  • Fixes PyPI authentication issues

Documentation Branding

• Implement jbcom brand standards per .cursor/rules/03-docs-branding.mdc
• Add jbcom-sphinx.css with:
  • Dark theme color palette (#0a0f1a background, #06b6d4 primary)
  • Typography: Space Grotesk/Inter/JetBrains Mono feel
  • Accessible focus states and reduced motion support
  • WCAG AA contrast compliance
• Configure Sphinx to apply branded CSS
• Add docs/.gitignore to exclude auto-generated API docs

Testing

• ✅ All 302 tests pass locally
• ✅ Linting passes
• ✅ Docs build successfully with warnings only
• ✅ Branding CSS applies correctly to generated HTML

Impact

• CI/CD: Fixes version publishing pipeline for future releases
• Documentation: Professional branded docs ready for GitHub Pages deployment
• 1.0 Release: Unblocks stable release process

Next Steps

After merge:

1. Monitor CI run to verify fix works
2. Verify PyPI publish succeeds
3. Enable GitHub Pages for documentation deployment
4. Proceed with 1.0.0 stable release

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Note

Addresses release packaging and documentation branding.

• CI release workflow now runs uv build after semantic-release version, replacing the artifact download step to ensure dist/ matches the bumped version
• New docs assets: adds docs/_static/jbcom-sphinx.css (dark theme/branding) and configures it via html_css_files in docs/conf.py; enables style_external_links in theme options
• Adds docs/.gitignore to exclude api/_autosummary/

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