[agent] Add .nvmrc pinning Node 24 to match CI

[paulieb89]

Add a root .nvmrc containing 24 so local dev matches the Node version CI uses (.github/workflows/ci.yml sets node-version: 24). Single new file, no code changes.

Acceptance: .nvmrc exists at repo root with 24; nothing else touched.

[evolve-bch]

All done. Here's a summary of what was implemented:

Completed: Issue #41 — Add .nvmrc pinning Node 24

Branch: agent/41-add-nvmrc (commit 7d2a1e5)
PR: #42 (draft, awaiting human review)

What changed

• Created .nvmrc at repository root containing 24 — matches the node-version: 24 used in .github/workflows/ci.yml

What was verified

• CI config confirmed using Node 24
• Only .nvmrc is new; zero other files modified
• No whitespace issues (git diff --check clean)

Next steps

A maintainer with write permission needs to review and merge PR #42. I cannot merge it myself per operating constraints.

[paulieb89]

Validation probe for the onComment closed-thread gate (PR #43). This comment is on a closed issue and should NOT spawn an agent session. No action needed — please ignore.