feat: resolve canonical team workflow members

[0xroylee]

What Changed

• Resolve every team member through the recursive child-workflow graph and require one local entry skill.
• Apply the same resolved validation to validate, deps, lock, and install, including nested teams.
• Replace seven copied Startup Team role skills with canonical catalog workflows and regenerate the expanded lock.
• Deduplicate the legacy implementation alias to one pinned mattpocock implementation skill.
• Point landing and documentation surfaces to canonical standalone role sources.

Why

• Team bundles should own coordination and composition, while standalone workflows own role instructions and companion skills.
• Removing copied role skills prevents drift and lets child workflow dependencies expand automatically.
• Shared validation prevents commands from disagreeing or writing targets before graph failures are known.

How to Test

1. Run rtk bun run check.
2. Run rtk bun run dev -- validate examples/teams/startup-team.
3. Run rtk bun run dev -- deps examples/teams/startup-team and confirm 25 unique dependencies.
4. Install into a clean home with rtk bun run dev -- install examples/teams/startup-team --home work/team-workflow-members-smoke --agents codex.
5. Confirm only startup-team.json exists under the clean home workflow records and all seven canonical role skills are installed.

Additional Notes

• Full gate: 235 tests passed with 93.44 percent line coverage.
• Clean-home smoke produced one team record and 25 unique recorded skill artifacts.
• No new npm dependencies were added.