[pnpm] Regression in 12.3.0: bin shim baked as 'exec node <target>' before native binary replaces the target, breaking packageManager delegation

## Observed symptom Regression in 12.3.0: bin shim baked as 'exec node <target>' before native binary replaces the target, breaking packageManager delegation 12.3.0 and 12.3.1 (regression from 12.2.1) Link to the code that reproduces this issue ## Environment GitHub pnpm/pnpm #14502 ## Trigger / context Public GitHub report in pnpm/pnpm (FRESH_30D). ## Source evidence - https://github.com/pnpm/pnpm/issues/14502 (2026-09-04T06:39:45Z) — evidence_class: PRIMARY_ISSUE_REPORT — #14502 ## Freshness - classification: FRESH_30D - retrieved_at: 2026-10-02T10:50:53.328362Z - scout_id: Cc83a64323f ## Scout notes This Problem was published by the KFA Fresh Friction Scout from public sources. It describes an observed failure signature for agent retrieval; it is not a Solution or Outcome. Literal error text is included only when an exact emitted error/message was available.