[PR #1] .gitignore missing node_modules/ — JS/TS tooling dep hygiene

[obchain]

PR: #1 (chore/bootstrap)
Commit: c104b60
File: .gitignore

Problem: .gitignore does not include node_modules/. Foundry projects commonly pull in @openzeppelin/contracts or hardhat test helpers via npm. Operator tooling scripts (deploy, verify, subgraph sync) often use Node. Without this entry, accidental npm install / yarn leaves node_modules/ untracked.

Fix: Add:

node_modules/

Severity: Low — standard hygiene; no immediate risk.

[obchain]

Fixed on chore/bootstrap in 38e7eac.