ci: fix 504 Electron download timeout and upgrade to Node 22

[NeuroKoder3]

Problem

All three failing checks hit the same root cause:
pm ci\ triggers Electron's postinstall script which downloads a ~100 MB binary from GitHub releases. That request times out with a 504 Gateway Timeout.

Additionally, @electron/notarize, @electron/rebuild, and
ode-abi\ all require >=22.12.0\ but every job was running Node 20.

Changes

*\ci.yml*

• Upgrade Node 20 → 22 across all jobs
• \ELECTRON_SKIP_BINARY_DOWNLOAD=1\ on \�uild\ and \�uild-windows\ (neither launches Electron)
• \�ctions/cache@v4\ on ~/.cache/electron\ in the \e2e\ job (needs the binary, cache survives future flakiness)
• \cache: 'npm'\ on all \�ctions/setup-node\ calls

*\security.yml*

• Upgrade Node 20 → 22 across all jobs (audit, snyk, lint, test-security, load-test, lockfile-check)
• \ELECTRON_SKIP_BINARY_DOWNLOAD=1\ on \ est-security\ and \load-test\ — fixes the two failing Security Scanning checks
• \load-test\ switched from
  pm install\ to
  pm ci\ for deterministic installs
• \cache: 'npm'\ everywhere

*
elease.yml*

• Upgrade Node 20 → 22 on build-windows, build-macos, and gate jobs
• \ELECTRON_SKIP_BINARY_DOWNLOAD=1\ on \gate\ (does not launch Electron)
• \cache: 'npm'\ everywhere