test: derive paid touchfiles from each eval's static closure (E)

touchfiles.test.ts now checks, per key, that the paid file's static
test/helpers and test/fixtures closure (plus fixture paths it names in string
literals) is covered, and names the file, path, chain and key to fix when it is
not. Free *.test.ts files are no longer touchfiles, so editing a free replay
test stops selecting paid evals: 950 entries removed, 653 real closure paths
added. The hand-copied inventories go: periodic-fixture-selection,
fake-impeccable-touchfiles and 45 per-file selection examples. Selection for
the sample edits (plan-eng-review template, claude-pty-runner,
plan-count-fixture, gstack-config) loses no case under either profile.
CONTRIBUTING documents the rule and its lower bound.

test/autoplan-snapshot.test.ts

@@ -503,7 +503,6 @@ describe('installed snapshot helper in fresh shells', () => {
   test('all affected live workflow selectors include the executable continuity contract', () => {
     for (const name of ['autoplan-dual-voice', 'carve-section-loading']) {
       expect(E2E_TOUCHFILES[name]).toContain('bin/gstack-autoplan-snapshot.ts');
-      expect(E2E_TOUCHFILES[name]).toContain('test/autoplan-snapshot.test.ts');
     }
   });
 });