Setup Deps

This skill should be used when the user asks to "set up Dependabot for this repo", "set up dependency automation", "set up dependency updates here", "set up dependabot auto-merge", "set up the dependency workflows", "add dependabot config here", "wire up dependabot auto-merge", "group the dependabot PRs", "stop the dependabot PR flood", "why do dependabot PRs keep failing CI", "fix the bun.lock dependabot problem", "regenerate lockfiles on dependabot PRs", or "standardize dependency updates across our repos". Generates and re-syncs a repo's `.github/dependabot.yml` plus its dependency automation workflows (auto-merge, bun.lock sync, pod lockfile sync) from detected ecosys…