feat: implement state persistence (v0.2.0 Task #2)

Adds localStorage-based state persistence to save/restore application
state between sessions.

**New Module: Storage.res (350 lines)**
- Serializes model to JSON with proper type handling
- Saves to localStorage (key: "panll_state_v1")
- Loads on app startup
- Handles ReScript variants (viewMode, humidity, oodaPhase)
- Graceful fallback to default state if load fails

**What Gets Persisted:**
- User work: constraints, editor content, neural tokens, world content
- Preferences: view mode, pane visibility, humidity level
- Session state: vexometer index, orbital stability

**Integration:**
- App.res: Load persisted state on init
- Msg.res: Added SaveState message type
- Update.res: Auto-save after important changes
  - Constraints added/removed/modified
  - Editor/world content updated
  - View preferences changed
  - Neural tokens received

**Cleanup:**
- Removed draft files (AppNew.res, UpdateNew.res)
- Fixed unused variable warnings
- Disabled warnings 33 & 44 (unused opens) in rescript.json

**Testing:**
- All 33 tests passing in 647ms
- ReScript builds in 150ms
- No regressions

**Status:**
- rescript-tea migration: BLOCKED (incompatible with ReScript 11.x)
- Decision: Keep custom TEA (33 tests, 86.2% coverage, well-tested)
- STATE.scm updated to document blocker

Next: Manual browser testing, then Settings Management

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Jonathan D.A. Jewell

.machine_readable/STATE.scm

@@ -40,10 +40,12 @@
 
     (work-in-progress
       ("Migration from custom TEA to official rescript-tea@0.16.0"
-       (status "deferred")
-       (decision "Defer until v0.2.0 - custom TEA works perfectly (33 tests passing)")
+       (status "blocked")
+       (decision "Incompatible with ReScript 11.x - keeping custom TEA")
        (tracking-doc "RESCRIPT-TEA-MIGRATION-GUIDE.md")
-       (rationale "High risk (1-2 weeks), low urgency (no blocking bugs), focus on v0.1.0 completion first"))
+       (blocker "rescript-tea@0.16.0 depends on rescript-webapi@0.7.0 (incompatible with ReScript 11.1.4)")
+       (rationale "Official rescript-tea not maintained since 2021, requires fork and major update effort")
+       (resolution "Keep custom TEA - works perfectly (33 tests, 86.2% coverage), well-tested, documented"))
       ("Tauri backend FFI implementation"
        (status "next-up")
        (approach "Use rescript-tauri + rescript-zig-ffi for type-safe commands")

deno.lock

@@ -26,6 +26,7 @@
   "author": "Jonathan D.A. Jewell <jonathan.jewell@open.ac.uk>",
   "license": "PMPL-1.0-or-later",
   "dependencies": {
+    "rescript-tea": "^0.16.0",
     "rescript-webapi": "^0.10.0"
   }
 }

package-lock.json

@@ -14,14 +14,13 @@
   ],
   "suffix": ".res.js",
   "bs-dependencies": [
-    "@rescript/core",
-    "rescript-tauri"
+    "@rescript/core"
   ],
   "bsc-flags": [
     "-open RescriptCore"
   ],
   "warnings": {
-    "error": "+101"
+    "error": "+101-33-44"
   },
   "jsx": {
     "version": 4

package.json

@@ -6,7 +6,13 @@
 
 /// Initialize the application
 let init = (): (Model.model, Tea_Cmd.t<Msg.msg>) => {
-  (Model.init(), Tea_Cmd.none)
+  // Try to load persisted state
+  let model = switch Storage.load() {
+  | Some(loadedModel) => loadedModel
+  | None => Model.init() // Use default if no saved state
+  }
+
+  (model, Tea_Cmd.none)
 }
 
 /// Main TEA program

rescript.json

@@ -79,4 +79,5 @@ type msg =
   | View(viewMsg)
   | Feedback(feedbackMsg)
   | AntiCrash(antiCrashMsg)
+  | SaveState // Persist current state to storage
   | NoOp