feat: Windows native Egui demo success + Paper C unified strategy

🎉 MAJOR MILESTONE: First successful Windows native Egui application
- Fixed stack overflow in plugin initialization
- Windows Egui demo running with JIT host-bridge
- Complete plugin system validation

📚 Paper C: Unified revolution strategy
- Three-paper approach: MIR13 + BoxCall + Unified
- ChatGPT5's "one representation, two execution" concept
- Complete experimental benchmark planning

🛠️ Technical achievements:
- nyash.exe with Cranelift JIT on Windows
- nyash_egui_plugin.dll (4.39MB) successful build
- VM + JIT + host-bridge integration working
- apps/egui-hello/main.nyash: open→uiLabel→run→close pipeline

🔬 Research foundation:
- docs/papers/active/paper-c-unified-revolution/ complete structure
- Benchmark experiments ready for Load/Store elimination validation
- AI-collaborative development methodology documented

This represents Phase 15 self-hosting technical foundation completion.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

tools/egui_win_smoke.ps1

@@ -0,0 +1,76 @@
+# Egui (Windows) JIT smoke: build nyash + egui plugin and run demo
+# Usage (PowerShell):
+#   pwsh -File tools/egui_win_smoke.ps1  # or .\tools\egui_win_smoke.ps1
+
+param(
+  [switch]$DebugBuild
+)
+
+$ErrorActionPreference = 'Stop'
+
+function Info($msg) { Write-Host "[egui-smoke] $msg" -ForegroundColor Cyan }
+function Warn($msg) { Write-Host "[egui-smoke] $msg" -ForegroundColor Yellow }
+function Die($msg)  { Write-Host "[egui-smoke] ERROR: $msg" -ForegroundColor Red; exit 1 }
+
+# 1) Build nyash with Cranelift JIT
+Info "Building nyash (cranelift-jit)..."
+$features = @('cranelift-jit')
+$mode = if ($DebugBuild) { 'debug' } else { 'release' }
+$cargoArgs = @('build','--features', ($features -join ','))
+if (-not $DebugBuild) { $cargoArgs += '--release' }
+
+& cargo @cargoArgs | Out-Host
+if ($LASTEXITCODE -ne 0) { Die "cargo build nyash failed" }
+
+$nyashExe = Join-Path -Path (Resolve-Path .).Path -ChildPath ("target/{0}/nyash{1}" -f $mode, (if ($IsWindows) {'.exe'} else {''}))
+if (-not (Test-Path $nyashExe)) {
+  Die "nyash binary not found: $nyashExe"
+}
+
+# 2) Build the egui plugin DLL with the real window feature
+Info "Building nyash-egui-plugin (with-egui)..."
+$pluginArgs = @('build','-p','nyash-egui-plugin','--features','with-egui')
+if (-not $DebugBuild) { $pluginArgs += '--release' }
+& cargo @pluginArgs | Out-Host
+if ($LASTEXITCODE -ne 0) { Die "cargo build nyash-egui-plugin failed" }
+
+$pluginDir = Join-Path -Path (Resolve-Path .).Path -ChildPath ("plugins/nyash-egui-plugin/target/{0}" -f $mode)
+if (-not (Test-Path $pluginDir)) { Die "plugin target dir not found: $pluginDir" }
+
+# 3) Environment toggles for JIT host-bridge path
+$env:NYASH_CLI_VERBOSE = '1'
+$env:NYASH_MIR_CORE13 = '1'
+$env:NYASH_OPT_DIAG_FORBID_LEGACY = '1'
+$env:NYASH_JIT_EXEC = '1'
+$env:NYASH_JIT_HOSTCALL = '1'
+$env:NYASH_JIT_HOST_BRIDGE = '1'
+
+# 4) Ensure plugin search paths include typical locations (nyash.toml already covers these)
+#    Allow overriding via NYASH_PLUGIN_PATHS if the user prefers a custom path list.
+if (-not $env:NYASH_PLUGIN_PATHS) {
+  $env:NYASH_PLUGIN_PATHS = @(
+    (Join-Path (Resolve-Path .).Path 'target\release'),
+    (Join-Path (Resolve-Path .).Path 'target\debug'),
+    (Join-Path (Resolve-Path .).Path 'plugins\nyash-egui-plugin\target\release'),
+    (Join-Path (Resolve-Path .).Path 'plugins\nyash-egui-plugin\target\debug')
+  ) -join ';'
+}
+
+# 5) Run the minimal Egui demo via Nyash script using JIT host-bridge
+$appScript = Join-Path -Path (Resolve-Path .).Path -ChildPath 'apps\egui-hello\main.nyash'
+if (-not (Test-Path $appScript)) { Die "demo script not found: $appScript" }
+
+Info "Launching Egui demo (JIT host-bridge)..."
+Write-Host "Command:" -ForegroundColor DarkGray
+Write-Host "  `"$nyashExe`" --backend vm --jit-exec --jit-hostcall `"$appScript`"" -ForegroundColor DarkGray
+
+& $nyashExe --backend vm --jit-exec --jit-hostcall $appScript
+$code = $LASTEXITCODE
+if ($code -ne 0) {
+  Warn "nyash exited with code $code"
+} else {
+  Info "Run finished (exit code 0). If on Windows, a window should have appeared."
+}
+
+Info "Done."
+