chore: update progress for US-059

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: NathanFlurry

progress.txt

@@ -2751,3 +2751,13 @@ PRD: ralph/kernel-hardening (46 stories)
   - ReaderResponseReceiver::new() takes Box<dyn Read + Send>, not a concrete type — need Box::new() wrapper
   - SIGSEGV on cargo test exit is pre-existing (V8 global state cleanup across test suites) — all 74 tests pass before SIGSEGV
 ---
+
+## 2026-03-19 - US-059
+- What was implemented: Replaced direct property assignment in setup-fs-facade.ts with Object.defineProperties using getters for all 19 fs bridge functions
+- Each _fs property getter now resolves globalThis._fsXxx at call time, not setup time — enabling snapshot-restored contexts to pick up replaced bridge function globals
+- Files changed: packages/secure-exec-core/isolate-runtime/src/inject/setup-fs-facade.ts, packages/secure-exec-core/src/generated/isolate-runtime.ts (auto-regenerated)
+- **Learnings for future iterations:**
+  - The getter pattern is transparent to callers — all existing fs tests pass unchanged with identical pass/fail counts
+  - packages/secure-exec-core/dist/ is gitignored — don't try to stage files from there
+  - The generated isolate-runtime.ts is auto-regenerated by `pnpm run --filter @secure-exec/core build` (specifically build:isolate-runtime)
+---

scripts/ralph/prd.json

@@ -1000,8 +1000,8 @@
         "Tests pass"
       ],
       "priority": 59,
-      "passes": false,
-      "notes": "Spec: docs-internal/specs/v8-context-snapshot.md Phase 1. Prerequisite for context snapshot."
+      "passes": true,
+      "notes": "Spec: docs-internal/specs/v8-context-snapshot.md Phase 1. Replaced direct property assignment with Object.defineProperties using getters for all 19 fs bridge functions. Each _fs.xxx call now resolves globalThis._fsXxx at call time, enabling snapshot restore to replace bridge globals."
     },
     {
       "id": "US-060",