fix: correct n8n node codex metadata

[guillaumegay13]

✨ What changed

• use the fully qualified Manifest node identifier
• move the node to the Development category
• remove unsupported codex metadata and add regression coverage
• prepare n8n-nodes-manifest 0.1.4

💭 Why

n8n's Creator Portal review blocks approval on the current codex metadata.

---

Summary by cubic

Fixes n8n codex metadata for the Manifest node to meet Creator Portal requirements and unblock verification. Uses the fully qualified node ID and correct category, with regression coverage added.

• Bug Fixes
  • Set node to n8n-nodes-manifest.manifest, move category to "Development", and remove unsupported subcategories.
  • Add a test that enforces allowed codex fields and expected node ID across nodes/, dist/, and repo files.
  • Bump n8n-nodes-manifest to 0.1.4 and update the changelog.

^{Written for commit e332e0e. Summary will update on new commits.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.98%. Comparing base (b33238c) to head (e332e0e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2563   +/-   ##
=======================================
  Coverage   96.98%   96.98%           
=======================================
  Files         584      584           
  Lines       41515    41515           
  Branches    14151    14151           
=======================================
  Hits        40265    40265           
  Misses        775      775           
  Partials      475      475           

Flag	Coverage Δ
backend	95.60% <ø> (ø)
frontend	98.05% <ø> (ø)
shared	99.16% <ø> (ø)

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