test(#4516): migrate per-runtime install/upgrade adapters to named timeout constants (#4582)

Batch 5 of the ad hoc timeout literal migration (epic #4445). Replaces
every bare numeric timeout/timeoutMs object-literal property across
tests/augment-upgrades.test.cjs, tests/shared-hooks-dir-resolution.test.cjs,
tests/antigravity-upgrades.test.cjs, tests/cursor-hooks.test.cjs,
tests/cursor-hook-workspace-roots.test.cjs, tests/gemini-runtime-removed.test.cjs,
tests/kilo-upgrades.test.cjs, tests/kimi-upgrades.test.cjs,
tests/kimi-variant-disambiguation.test.cjs, tests/opencode-plugin-adapter.test.cjs,
tests/windsurf-hooks-bridge.test.cjs, tests/effort-sync-installed-runtime.test.cjs,
and tests/hooks-commonjs-marker.test.cjs with a named constant, per
eslint-rules/no-adhoc-timeout-literal.cjs. Removes these 13 files from the
rule's allowlist.

Adds one new shared constant to tests/helpers/timeouts.cjs for spawning a
single already-staged hook script directly (a heavier class than the
existing quick-spawn norm), shared across three files in this batch. One
new file-local constant covers a property-test driver process distinct
from any existing class. Every other site reuses an existing shared norm.
No src/bin file touched, no numeric timeout value changed anywhere.

Co-authored-by: sim <sim@local>
Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

tests/opencode-plugin-adapter.test.cjs

@@ -26,6 +26,7 @@ const fs = require('node:fs');
 const path = require('node:path');
 const os = require('os');
 const { cleanup } = require('./helpers.cjs');
+const { INSTALL_TIMEOUT_MS } = require('./helpers/timeouts.cjs');
 
 const ADAPTER_SRC = path.join(__dirname, '..', '.opencode', 'plugins', 'gsd-core.js');
 
@@ -436,7 +437,7 @@ test('installer copies plugin as .js, records it in the manifest, and removes it
 
   const run = (args) => {
     const result = runNode([installer, '--opencode', '--global', '--config-dir', cfg, ...args], {
-      timeoutMs: 120000,
+      timeoutMs: INSTALL_TIMEOUT_MS,
       // #3156: sandbox HOME — the installer writes <home>/.gsd/defaults.json via
       // os.homedir() directly, which no env scrub can reach. See installSpawnEnv.
       env: require('./helpers.cjs').installSpawnEnv(),