chore: update uf tooling scaffolds (agents, commands, packs, skills)

[jflowers]

Updates scaffolded files from uf init / uf setup / gaze init tooling.

Changes

New files

• .opencode/agents/reviewer-testing.md — new testing review agent
• .opencode/commands/address-feedback.md — new feedback command
• .opencode/commands/triage-issue.md — new issue triage command
• .opencode/skills/pre-flight/SKILL.md — new pre-flight skill
• .opencode/uf/packs/python.md — Python convention pack
• .opencode/uf/packs/python-custom.md — Python custom overrides

Updated files

• .cursorrules — minor cleanup
• .opencode/agents/ — background-worker, coordinator, gaze-reporter, gaze-test-generator, worker agents
• .opencode/commands/ — agent-brief, finale, review-council, review-pr, uf-init, unleash commands
• .opencode/references/ — doc-scoring-model, example-report references
• .opencode/uf/packs/severity.md — severity pack additions

Not included

• .uf/replicator/replicator.log — runtime artifact
• release-ci-gate.md — stray spec artifact (not from uf tooling)

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ REPOSITORY	gitleaks	yes		no	no	1.49s
✅ REPOSITORY	git_diff	yes		no	no	0.17s

See detailed reports in MegaLinter artifacts
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff