Phase 1 added impl Drop for SessionHandle on the Rust side so .free()
now actually removes the SESSIONS registry entry. The JS-side
try { current.free() } catch { /* already freed */ } swallow was
hiding the fact that .free() wasn't doing the cleanup at all;
post-Phase-1 it has to go so failures surface instead of being lost.
.free() callsite audit: exactly one match under extension/src/ — the
SW session.ts line this commit edits. Lifecycle audit: clearCurrent()
is reached via (a) popup lock → router popup-only.ts and (b)
session-timer expiry → service-worker/index.ts.
Refs: docs/superpowers/specs/2026-05-04-security-polish-design.md (Phase 2)
Refs: docs/superpowers/reviews/2026-05-04-architecture-review.md (P1.1, DEV-C P2 service-worker)
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
03d0781c39