feat(gossamer): complete Tauri elimination; Gossamer-native IPC

src-tauri/ deleted (Rust/Cargo backend gone entirely):
- Removes glib 0.18.5 MODERATE Dependabot alert (only remaining vuln)
- Removes openssl 0.10.77 vestiges
- 0 Dependabot alerts remain after GitHub re-scan

ReScript frontend rewritten for pure Gossamer IPC:
- TauriFFI.res → OpsmCommands.res: no Tauri naming; ipcError type replaces
  Tauri_Command.commandError; runtime management commands added (runtimeList,
  runtimeInstall, runtimeRemove, runtimeSearch, healthCheck)
- RuntimeBridge.res: Tauri fallback branches removed; Gossamer-first +
  browser-HTTP fallback for development; Fs/Dialog/Event Gossamer-only
- App.res: all TauriFFI.*/Tauri_Command.* → OpsmCommands.*/IpcError.*
- deno.json: @tauri-apps/api, @tauri-apps/plugin-fs, @tauri-apps/plugin-dialog,
  rescript-tauri removed; tauri/tauri:build/tauri:android/tauri:ios tasks removed
- rescript.json: rescript-tauri removed from bs-dependencies

Gossamer expansion: OpsmCommands now also exposes opsm_runtime panel IPC
commands (list/install/remove/search) via window.__gossamer_invoke so the
panel harness can call them without HTTP round-trips.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: hyperpolymath

opsm_mobile/deno.json

@@ -4,21 +4,13 @@
     "react-dom": "npm:react-dom@^18.3.0",
     "@rescript/react": "npm:@rescript/react@^0.12.0",
     "rescript-tea": "npm:rescript-tea@latest",
-    "rescript-tauri": "npm:rescript-tauri@latest",
     "cadre-router": "npm:cadre-router@latest",
-    "cadre-tea-router": "npm:cadre-tea-router@latest",
-    "@tauri-apps/api": "npm:@tauri-apps/api@^2.0.0",
-    "@tauri-apps/plugin-fs": "npm:@tauri-apps/plugin-fs@^2.0.0",
-    "@tauri-apps/plugin-dialog": "npm:@tauri-apps/plugin-dialog@^2.0.0"
+    "cadre-tea-router": "npm:cadre-tea-router@latest"
   },
   "tasks": {
     "build": "rescript build",
     "clean": "rescript clean",
     "dev": "rescript build -w",
-    "tauri": "cargo tauri dev",
-    "tauri:build": "cargo tauri build",
-    "tauri:android": "cargo tauri android init && cargo tauri android build",
-    "tauri:ios": "cargo tauri ios init && cargo tauri ios build",
     "gossamer:dev": "deno task dev & gossamer dev --config gossamer.conf.json",
     "gossamer:build": "deno task build && gossamer build --config gossamer.conf.json"
   },

opsm_mobile/rescript.json

@@ -17,7 +17,6 @@
   "bs-dependencies": [
     "@rescript/react",
     "rescript-tea",
-    "rescript-tauri",
     "cadre-router",
     "cadre-tea-router"
   ],