ci: bump Node to 22 and silence knip on cloudflare:test virtual module

CI Node 20 → 22 because @cloudflare/vitest-pool-workers transitively
pulls @cloudflare/kv-asset-handler@0.5.0 which requires Node ≥22.

knip drift sensor was flagging every `cloudflare:test` import as an
unlisted dependency (it doesn't grok the virtual-module convention).
Added `cloudflare` to knip.json's ignoreDependencies so the sensor stops
opening tracking issues for this. The package itself is provided by
@cloudflare/vitest-pool-workers and not a real dependency entry.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: fullstackjam

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '22'
 
       - name: Install dependencies
         run: npm install --legacy-peer-deps

.github/workflows/deploy.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '22'
 
       - name: Install dependencies
         run: npm install --legacy-peer-deps

.github/workflows/harness.yml

@@ -34,7 +34,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '22'
       - name: npm audit --audit-level=high
         # Fails on a high-or-critical advisory. Production-only because we
         # don't act on devDep advisories (no runtime exposure).
@@ -48,7 +48,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '22'
       - name: Install dependencies
         run: npm install --legacy-peer-deps --no-audit --no-fund
       - name: Run knip

knip.json

@@ -1,7 +1,7 @@
 {
 	"$schema": "https://unpkg.com/knip@5/schema.json",
 	"entry": ["src/lib/components/SearchModal.svelte!"],
-	"ignoreDependencies": ["@cloudflare/workers-types"],
+	"ignoreDependencies": ["@cloudflare/workers-types", "cloudflare"],
 	"rules": {
 		"exports": "off",
 		"types": "off",