feat: add nub package manager detection

[colinhacks]

Adds detection for nub, a package manager whose native lockfile is nub.lock (pnpm-v9-compatible lockfile format).

What changed

• Registers a nub entry in AVAILABLE_PACKAGE_MANAGERS (@netlify/build-info), mirroring the existing bun entry: installCommand: 'nub install', runCommand: 'nub run', localPackageCommand/remotePackageCommand: 'nubx', lockFiles: ['nub.lock'].
• Adds NUB to the PkgManager enum and a nub branch to sniffUserAgent.
• Tests: a nub.lock root-detection case plus the nub user-agent variant in the existing parametrized suite.

Purely additive — no existing package manager's entry or behavior changes.

Verified with npm run build and vitest run in packages/build-info (all green); oxfmt --check and eslint clean on the touched files.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This change adds support for a new package manager called "nub" to the package manager detection utility. It introduces a NUB enum member, adds a corresponding configuration entry with install/run/local/remote commands and lock file mapping, updates user-agent sniffing logic to recognize "nub", and adds test coverage for both user-agent-based and lock-file-based detection.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant detectPackageManager
  participant sniffUserAgent
  participant AVAILABLE_PACKAGE_MANAGERS

  Caller->>detectPackageManager: request package manager detection
  detectPackageManager->>detectPackageManager: check nub.lock file existence
  alt nub.lock found
    detectPackageManager->>AVAILABLE_PACKAGE_MANAGERS: lookup NUB config
    AVAILABLE_PACKAGE_MANAGERS-->>detectPackageManager: return nub config
  else lock file not found
    detectPackageManager->>sniffUserAgent: check npm_config_user_agent
    sniffUserAgent-->>detectPackageManager: return PkgManager.NUB if "nub" present
  end
  detectPackageManager-->>Caller: return nub package manager config

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Related issues: None specified.

Related PRs: None specified.

Suggested labels: enhancement, package-managers

Suggested reviewers: None specified.

🐰 A tiny hop, a lock file found,
"nub" now joins the pack-managed ground,
Enums and configs, snug in a row,
Sniffing agents where npm scripts go,
Another manager for builds to embrace!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely states the main change: adding nub package manager detection.
Description check	✅ Passed	The description covers the summary, implementation, tests, and verification; only the issue reference and template extras are missing.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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