test(#4518): migrate loop/hook-point e2e batch to named timeout constants

Batch 7 of 17 in the ad hoc timeout literal migration (epic #4445).
Replaces every bare numeric timeout/timeoutMs object-literal property in
tests/loop-render-hooks.test.cjs, tests/loop-walk.qa.test.cjs,
tests/loop-hooks-empty-points-e2e.test.cjs, tests/loop-hooks-ship-pre-e2e.test.cjs,
tests/loop-hooks-verify-post-e2e.test.cjs, tests/check-gap-analysis-plan-post-e2e.test.cjs,
tests/check-tdd-review-checkpoint-e2e.test.cjs, tests/execute-wave-post-gate-pipeline-e2e.test.cjs,
tests/plan-pre-hook-e2e.test.cjs, and tests/qa/tdd-walk.cjs with a named
constant, per eslint-rules/no-adhoc-timeout-literal.cjs. Removes the 10
files from the rule's allowlist.

Promotes a new shared class norm to tests/helpers/timeouts.cjs,
LOOP_HOOK_POINT_CLI_TIMEOUT_MS: 7 files independently arrived at the same
value for a single gsd-tools.cjs CLI subcommand invocation with no
confirmed subprocess fan-out. Reuses the existing PROBE_TIMEOUT_MS for
loop-render-hooks.test.cjs's 11 sites (same class, exact value match).
Adds 4 file-local constants for values that share a class with the new
norm or an existing one but diverge in pre-existing value, or that
numerically coincide with an unrelated existing constant without
matching its actual operation.

Isolated Standards-axis review caught that the new shared constant's doc
comment exhaustively enumerated 3 verb families while a 7th genuine site
(an `init new-project` invocation) also correctly belonged to the class;
fixed by rewording the comment to state the class definition (call
shape) first and list all 4 representative verbs, explicitly
illustrative rather than exhaustive. No value changed, no site's
classification changed.

No src/bin file touched, no numeric value changed anywhere.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tests/loop-hooks-empty-points-e2e.test.cjs

@@ -28,6 +28,7 @@ const path = require('node:path');
 const { spawnSync } = require('node:child_process');
 
 const { cleanup, installSpawnEnv } = require('./helpers.cjs');
+const { LOOP_HOOK_POINT_CLI_TIMEOUT_MS } = require('./helpers/timeouts.cjs');
 
 const GSD_TOOLS = path.join(__dirname, '..', 'gsd-core', 'bin', 'gsd-tools.cjs');
 const realRegistry = require('../gsd-core/bin/lib/capability-registry.cjs');
@@ -68,7 +69,7 @@ function spawnGsd(args, cwd) {
   return spawnSync(process.execPath, [GSD_TOOLS, ...args], {
     cwd: cwd || os.tmpdir(),
     encoding: 'utf8',
-    timeout: 60000,
+    timeout: LOOP_HOOK_POINT_CLI_TIMEOUT_MS,
     env: installSpawnEnv(),
   });
 }