Remove paired execution shared shim

src/paired-execution-context-shared.ts

@@ -1,27 +0,0 @@
-export { requestArbiterOrEscalate } from './paired-arbiter-request.js';
-export type { RequestArbiterOrEscalateFn } from './paired-arbiter-request.js';
-export {
-  resolveOwnerCompletionSignal,
-  resolveReviewerCompletionSignal,
-  resolveReviewerFailureSignal,
-} from './paired-completion-signals.js';
-export type { CompletionSignal } from './paired-completion-signals.js';
-export {
-  classifyArbiterVerdict,
-  parseVisibleVerdict,
-} from './paired-verdict.js';
-export type { ArbiterVerdictResult, VisibleVerdict } from './paired-verdict.js';
-export {
-  hasCodeChangesSinceRef,
-  resolveCanonicalSourceRef,
-} from './paired-source-ref.js';
-export {
-  ALLOWED_PAIRED_STATUS_TRANSITIONS,
-  applyPairedTaskPatch,
-  assertPairedTaskStatusTransition,
-  transitionPairedTaskStatus,
-} from './paired-task-status.js';
-export type {
-  ApplyPairedTaskPatchFn,
-  TransitionPairedTaskStatusFn,
-} from './paired-task-status.js';