Summary:

• Backports fix(codex): route workspace memory through tools #87383 to release/2026.5.27.
• Routes configured-workspace Codex MEMORY.md through memory tools with a small pointer when tools are available.
• Keeps bounded raw MEMORY.md fallback when tools are unavailable or active workspace differs, and preserves extra nested MEMORY.md bootstrap files.

Verification:

• pnpm install
• fnm exec --using 24.15.0 -- node scripts/run-vitest.mjs run --config test/vitest/vitest.extension-codex.config.ts --configLoader runner extensions/codex/src/app-server/run-attempt.test.ts -t "MEMORY.md" --reporter=verbose
• node scripts/run-oxlint.mjs --tsconfig config/tsconfig/oxlint.extensions.json extensions/codex/src/app-server/run-attempt.ts extensions/codex/src/app-server/run-attempt.test.ts src/plugin-sdk/agent-harness-runtime.ts
• fnm exec --using 24.15.0 -- node scripts/run-tsgo.mjs -p tsconfig.extensions.json --incremental --tsBuildInfoFile .artifacts/tsgo-cache/extensions-backport.tsbuildinfo
• fnm exec --using 24.15.0 -- node scripts/run-tsgo.mjs -p test/tsconfig/tsconfig.extensions.test.json --incremental --tsBuildInfoFile .artifacts/tsgo-cache/extensions-test-backport.tsbuildinfo
• pnpm check:docs
• git diff --check origin/release/2026.5.27...HEAD

Behavior addressed: Native Codex release builds no longer paste configured workspace MEMORY.md into every turn when memory tools can serve it on demand.
Real environment tested: Local release/2026.5.27 checkout on Node 24.15.0.
Exact steps or command run after this patch: Focused MEMORY.md Vitest filter plus touched lint, extension typecheck, extension test typecheck, docs check, and diff whitespace check.
Evidence after fix: MEMORY.md focused tests passed: 7 passed, 239 skipped in run-attempt.test.ts.
Observed result after fix: Root MEMORY.md routes through memory_search/memory_get pointer when available, falls back to bounded context without tools or with a noncanonical workspace, and nested MEMORY.md stays in context.
What was not tested: Full release CI was not run locally; autoreview process hung after 6 minutes and returned empty output.