CLXP-879: Node 22 — BREAKING engines bump (semver-major, owner gates publish)

[silouone]

CLXP-879: Node EOL remediation — bump to Node 22

This is part of the Node EOL remediation track. @coorpacademy/update-node is a published npm tool, so bumping the engines floor is a BREAKING change.

⚠️ BREAKING CHANGE

• package.json engines.node moves from >=18.12.1 → >=22.0.0.
• Any consumer still running Node <22 will fail the engines check on install.
• Recommend releasing as v8.0.0 (semver MAJOR). The current version is 7.7.0.
• The maintainer controls the actual npm publish — this PR only lands the source change. No publish is performed here.

Changes

File	Change
.nvmrc	v20.17.0 → v22.0.0
package.json	engines.node: >=18.12.1 → >=22.0.0 (npm field unchanged — it was never set)
.travis.yml	default node_js 20 → 22; dropped the Node 18 test job (matrix now 20 + 22)
.github/workflows/ci.yml	dropped 18.x from the matrix (now ['20.x', '22.x'])

Explicitly NOT touched

• Everything under test/integration/ — the Node 12/14/18 + Python 3.8 values there are intentional input fixtures for the tool's own patching tests, not runtime targets.

Consumer note

• The coorpacademy monorepo is already on Node 22, so it is unaffected by the new floor.
• External consumers on Node <22 must upgrade their runtime before taking the next major.

Validation

• package.json re-parsed with node -e JSON.parse ✅
• .travis.yml re-parsed (YAML anchors resolve; test jobs = node20, node22) ✅
• No npm install / full test run — CI validates.

🤖 Generated with Claude Code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.12%. Comparing base (de375f5) to head (323d537).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #155   +/-   ##
=======================================
  Coverage   75.12%   75.12%           
=======================================
  Files          19       19           
  Lines         619      619           
=======================================
  Hits          465      465           
  Misses        154      154           

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