feat(agent): bundle commit-push-pr skill

[wgqqqqq]

Summary

• Bundle commit-push-pr as a release-managed built-in BitFun skill.
• Register it in the runtime-owned meta skill group so it is available by default.
• Route ordinary commit/push/pull-request requests to the lightweight workflow while keeping gstack-ship focused on explicit full ship, release, and deploy workflows.
• Add catalog, default-policy, embedded-content, attribution, and trigger-ownership regression coverage.

Type and Areas

Type:

Feature / test

Areas:

Agent Runtime, Product Assembly, built-in Skills

Motivation / Impact

BitFun users can request a Claude Code-like one-command PR publishing flow without first installing a personal skill. The built-in workflow stages only intentional files, validates before publishing, avoids history rewriting, updates matching PRs instead of duplicating them, and applies the standard BitFun commit/PR attribution contract.

Separating its ordinary PR trigger from gstack-ship prevents two default skills from claiming the same request. gstack-ship remains the owner of the heavier version/changelog/release workflow.

Verification

• cargo test --locked -p bitfun-agent-runtime --no-default-features --features agent-runtime --test agent_definition_contracts skill_contracts::builtin_skill_catalog_and_mode_policy_are_runtime_owned — passed.
• cargo test --locked -p bitfun-core --no-default-features --features agent-runtime --lib commit_push_pr_is_bundled_with_attribution_and_owns_lightweight_pr_requests — passed.
• cargo test --locked -p bitfun-core --no-default-features --features agent-runtime --lib runtime_catalog_covers_all_embedded_builtin_skills — passed.
• pnpm run check:repo-hygiene — passed.
• git diff --check — passed.
• The bundled SKILL.md was byte-compared with the provided source and is identical.

Testing level: lightly tested. Focused automated contracts passed; the installed application workflow was not exercised end to end against a disposable GitHub repository.

Reviewer Notes

• AI-assisted implementation.
• Existing user/project skills retain their normal source precedence; this change adds a managed system candidate rather than overwriting user-authored skill content.
• The bundled skill remains platform-agnostic and delegates local repository operations to the Git tool and remote PR operations to ReviewPlatform, with documented fallbacks.
• Remote workspace, Remote Control, Peer Device Mode, and Detached Dispatch were not exercised end to end. No persisted schema or cross-version wire contract changed.

Checklist

• This PR is focused and does not include secrets, temporary prompts, generated scratch files, or unrelated artifacts.
• Relevant verification is recorded above, or skipped checks are explained.
• User-facing strings, docs, and locales are updated where applicable.

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