test: delete tests of dead eval code (A)

- A1: the retired Eng lexical oracle (evaluateEngSeedCoverage,
  isEngSeedDecisionAUQ), the completion-handoff detector and the retained
  corpus had no paid caller since v1.87.6; delete their 26 replay files,
  ~2.6k helper LOC and fixtures, and the dead blocks in 8 mixed files
  (live hasNativePlanTerminal / batching assertions stay).
- A2: dead viewport approvers in autoplan-artifact-permission and their 11
  replay files + fixtures; recorder/launcher cases stay.
- A3: never-wired oracles and seeders (autoplan-phase-order,
  eng-finding-fixture, ceo-paired-fixture, design-ui-scope,
  plan-skill-completion, pty-current-screen, required-reads,
  transcript-section-logger); plan-seed-submission now decodes through the
  production createPtyScreen; section manifests name their actual guard.
- A4: zero-reference helper exports, plus execGit and invokeAndObserve
  found by the reachability pass.
- 52 fixtures orphaned by the deletions; touchfile and selection-table
  entries for every deleted path.

test/helpers/cso-eval-oracles.ts

@@ -1,6 +1,6 @@
 /** Private evaluator inputs. Never copy this module or its JSON output into producer snapshots. */
 import { createHash } from 'node:crypto';
-import { CORPUS_VERSION, type EvalFamily, type EvalStack } from '../fixtures/cso-eval/materialize';
+import { CORPUS_VERSION, type EvalFamily } from '../fixtures/cso-eval/materialize';
 
 export interface OracleRequest { method: 'GET' | 'POST'; path: string; body?: string; headers?: Record<string, string> }
 export interface OracleResponse { status: number; body: string; headers?: Record<string, string> }
@@ -100,9 +100,3 @@ export function judgeRepair(family: EvalFamily, evidence: PrivateEvidence): { re
     && patched.existingTestsPassed && evidence.immutableVerifier && evidence.independentRootCauseReview && evidence.featurePreserved && !evidence.boundaryMocks;
   return { reproduced, correctRepair, evidenceHash: createHash('sha256').update(JSON.stringify({ version: oracle.version, family, evidence })).digest('hex') };
 }
-export function runtimeStart(stack: EvalStack): { executable: string; args: string[]; port: 8000; environment: Record<string, string> } {
-  return stack === 'node' ? { executable: '/usr/local/bin/node', args: ['app.mjs'], port: 8000, environment: {} }
-    : stack === 'bun' ? { executable: '/usr/local/bin/bun', args: ['--no-install', 'app.ts'], port: 8000, environment: {} }
-    : stack === 'python' ? { executable: '/usr/local/bin/python', args: ['-I', 'app.py'], port: 8000, environment: {} }
-    : { executable: '/usr/local/bin/ruby', args: ['bin/rails', 'server', '-e', 'test', '-b', '127.0.0.1', '-p', '8000'], port: 8000, environment: { RAILS_ENV: 'test', RACK_ENV: 'test' } };
-}