fix(shared): share request context stores across duplicated modules - #15395

⚠️ base-red inherited: #15306

Summary

The correlation id and request id stores were still module-level AsyncLocalStorage instances, the pattern #14620 moved off for the proxy context: when bundling duplicates one of these modules, the copy that opens the context isn't the one that reads it, and the read falls back to the empty value. Both stores now key off globalThis via Symbol.for, so a read from any copy sees the context opened by any other copy; without duplication nothing changes.

Related Issues

• Related to fix(sse): share applied proxy capture across duplicated fetch modules #14620

Validation

• Change type: other
• Focused tests and category gates from the golden path
• npm run lint — ESLint on the touched files is clean; the full run is red on the base (🔴 Release branch not green: release/v3.8.52 #15306).
• Reconciled with the current active release base; focused checks rerun afterward
• Production-code changes include a new or updated automated test in this PR

Tests Added Or Updated

• tests/unit/share-request-context-symbol-for.test.ts — cross-copy interleaving for both stores, plus sequential isolation and out-of-context empty values.

Coverage Notes

• The correlation middleware store is covered by the new cross-copy test, including the sequential-isolation case.
• The request identifier store is covered by the new cross-copy test, including the out-of-context empty value case.

Reviewer Notes

N/A — nothing beyond the Summary changes the review.