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/ceo-expansion-auq.test.ts

@@ -5,7 +5,6 @@ import * as path from 'node:path';
 import { findCeoModeOption, hasNativePostAnswerCeoPosture } from './helpers/ceo-mode-option';
 import { parseNumberedOptions } from './helpers/claude-pty-runner';
 import { readPlanCountTranscript, type NativePublicToolEvent } from './helpers/plan-count-transcript';
-import { E2E_TOUCHFILES, selectTests } from './helpers/touchfiles';
 import captured from './fixtures/ceo-expansion-auq-ac.json';
 
 const posture = /\b(expansion|10x|delight|dream|cathedral|opt[\s-]?in)\b/i;
@@ -118,10 +117,4 @@ describe('CEO expansion posture in a completed native decision brief', () => {
       (records: Records) => { records[6]!.message.content[0]!.is_error = true; },
     ]) expect(matches(replay(change))).toBe(false);
   });
-
-  test('the new free test and captured fixture select the paid mode-routing case', () => {
-    for (const file of ['test/ceo-expansion-auq.test.ts', 'test/fixtures/ceo-expansion-auq-ac.json']) {
-      expect(selectTests([file], E2E_TOUCHFILES, []).selected).toEqual(['plan-ceo-mode-routing']);
-    }
-  });
 });