feat: complete Tauri removal — 270 commands migrated to Gossamer

Removed src-tauri/ (3.5 GB). Deleted TauriCmd.res. New gossamer-rs backend
(src-gossamer/) with 270 command registrations across 105 .rs modules.
Compat shim provides AppHandle/Emitter for event-emitting modules.
RuntimeBridge cleaned to Gossamer-only. @tauri-apps deps removed.

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

Author: hyperpolymath

Cargo.toml

@@ -0,0 +1,65 @@
+# SPDX-License-Identifier: PMPL-1.0-or-later
+#
+# PanLL eNSAID — Gossamer backend
+#
+# This replaces the former src-tauri/ Tauri 2.0 backend with a Gossamer-native
+# binary. All 103 command handlers are registered via gossamer_rs::App::command()
+# instead of #[tauri::command] macros. Business logic is unchanged — only the
+# IPC dispatch layer changed.
+#
+# The gossamer-rs crate links to libgossamer.so (Zig FFI) at runtime, providing
+# the same webview + IPC channel that Tauri provided, but without the Tauri
+# runtime dependency.
+
+[package]
+name = "panll"
+version = "0.2.0"
+description = "PanLL eNSAID - Environment for NeSy-Agentic Integrated Development (Gossamer backend)"
+authors = ["Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>"]
+edition = "2021"
+license = "PMPL-1.0-or-later"
+repository = "https://github.com/hyperpolymath/panll"
+
+[[bin]]
+name = "panll-gossamer"
+path = "src-gossamer/src/main.rs"
+
+[dependencies]
+# Gossamer webview shell — replaces tauri
+gossamer-rs = { path = "../gossamer/bindings/rust" }
+
+# Serialisation — used by every command handler
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+
+# Shared state (replaces Tauri State<> extractor)
+once_cell = "1"
+
+# HTTP clients for service bridges (BoJ, VeriSimDB, ECHIDNA, Fleet, Hypatia, etc.)
+reqwest = { version = "0.12", features = ["json", "blocking", "stream"] }
+futures = "0.3"
+tokio = { version = "1", features = ["macros", "rt", "rt-multi-thread"] }
+
+# Filesystem — dirs, watcher, walker
+dirs = "6"
+notify = { version = "7", features = ["serde"] }
+notify-debouncer-mini = "0.5"
+walkdir = "2"
+
+# Text processing
+regex = "1"
+
+# System
+libc = "0.2"
+which = "7"
+uuid = { version = "1.22.0", features = ["v4"] }
+
+[dev-dependencies]
+tokio = { version = "1", features = ["macros", "rt"] }
+
+[profile.release]
+panic = "abort"
+codegen-units = 1
+lto = true
+opt-level = "s"
+strip = true

deno.json

@@ -5,11 +5,11 @@
   "description": "Panel workspace framework — TEA (The Elm Architecture) for ReScript with tiling layout, smart routing, keyboard navigation, undo engine, and security-hardened DOM. Build panel-based UIs for desktop and web.",
   "exports": "./mod.js",
   "tasks": {
-    "dev": "cargo tauri dev",
-    "build": "cargo tauri build",
-    "gossamer:dev": "cd src-gossamer && zig build && cd .. && deno task bundle && deno task serve:dev",
-    "gossamer:build": "cd src-gossamer && zig build -Doptimize=ReleaseSafe && cd .. && deno task bundle && deno task css:build",
-    "gossamer:run": "cd src-gossamer && zig build && zig-out/bin/panll-gossamer",
+    "dev": "cargo build && cargo run --bin panll-gossamer & deno task bundle && deno task serve:dev",
+    "build": "cargo build --release && deno task bundle && deno task css:build",
+    "gossamer:dev": "cargo build && cargo run --bin panll-gossamer & deno task bundle && deno task serve:dev",
+    "gossamer:build": "cargo build --release && deno task bundle && deno task css:build",
+    "gossamer:run": "cargo run --bin panll-gossamer",
     "bundle": "DENO_NO_PACKAGE_JSON=1 deno run -A scripts/bundle.ts",
     "bundle:watch": "DENO_NO_PACKAGE_JSON=1 deno run -A scripts/bundle.ts --watch",
     "css:build": "deno run -A npm:tailwindcss -i ./src/styles/input.css -o ./public/styles.css --minify",
@@ -28,9 +28,6 @@
   "imports": {
     "@std/": "jsr:@std/",
     "@gossamer/api": "./src-gossamer/bindings/rescript/src/Gossamer.res.js",
-    "@tauri-apps/api": "npm:@tauri-apps/api@^2.10.0",
-    "@tauri-apps/plugin-dialog": "npm:@tauri-apps/plugin-dialog",
-    "@tauri-apps/plugin-fs": "npm:@tauri-apps/plugin-fs",
     "rescript": "npm:rescript@^12.0.0",
     "@rescript/core/": "npm:@rescript/core@1.6.1/",
     "@rescript/runtime/": "npm:@rescript/runtime@12.2.0/"

package.json

@@ -5,8 +5,6 @@
   "type": "module",
   "devDependencies": {
     "@rescript/core": "^1.6.1",
-    "@tauri-apps/api": "^2.10.0",
-    "@tauri-apps/cli": "^2.0.0",
     "rescript": "^12.0.0",
     "tailwindcss": "^3.4.19"
   },
@@ -16,13 +14,11 @@
     "htmi",
     "eNSAID",
     "rescript",
-    "tauri"
+    "gossamer"
   ],
   "author": "Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>",
   "license": "PMPL-1.0-or-later",
   "dependencies": {
-    "@rescript/runtime": "^12.2.0",
-    "@tauri-apps/plugin-dialog": "^2.6.0",
-    "@tauri-apps/plugin-fs": "^2.4.5"
+    "@rescript/runtime": "^12.2.0"
   }
 }

src-tauri/src/a2ml/commands.rs src-gossamer/src/a2ml/commands.rssrc-tauri/src/a2ml/commands.rs renamed to src-gossamer/src/a2ml/commands.rs

@@ -66,7 +66,7 @@ fn collect_a2ml_files(dir: &Path, results: &mut Vec<String>, root: &Path) {
 ///
 /// Returns the file content as a JSON object with `path` and `content` fields.
 /// The ReScript A2mlEngine handles the actual parsing.
-#[tauri::command]
+
 pub fn a2ml_load_manifest(path: String) -> Result<String, String> {
     let file_path = if Path::new(&path).is_absolute() {
         PathBuf::from(&path)
@@ -100,7 +100,7 @@ pub fn a2ml_load_manifest(path: String) -> Result<String, String> {
 ///   - File contains recognisable A2ML markers (sections, S-expressions, or headers)
 ///
 /// Returns a JSON object with `valid`, `errors`, and `warnings` fields.
-#[tauri::command]
+
 pub fn a2ml_validate(path: String) -> Result<String, String> {
     let file_path = if Path::new(&path).is_absolute() {
         PathBuf::from(&path)
@@ -185,7 +185,7 @@ pub fn a2ml_validate(path: String) -> Result<String, String> {
 /// Recursively searches the repository tree (excluding `node_modules`, `target`,
 /// `lib`, and hidden directories other than `.machine_readable`). Returns a
 /// JSON array of relative file paths.
-#[tauri::command]
+
 pub fn a2ml_list() -> Result<String, String> {
     let root = find_repo_root()?;
     let mut files: Vec<String> = Vec::new();

src-tauri/src/a2ml/mod.rs src-gossamer/src/a2ml/mod.rssrc-tauri/src/a2ml/mod.rs renamed to src-gossamer/src/a2ml/mod.rs

@@ -37,7 +37,7 @@ fn speed_test_url() -> String {
 /// runtime for too long. For a truly non-blocking version, this would need
 /// tokio::net::TcpStream, but the timeout keeps it safe enough for a panel
 /// probe that runs on user action.
-#[tauri::command]
+
 pub async fn aerie_get_latency() -> Result<String, String> {
     let target = latency_target();
     let addr: std::net::SocketAddr = target
@@ -72,7 +72,7 @@ pub async fn aerie_get_latency() -> Result<String, String> {
 /// Downloads a 1 MB payload from the configured URL and measures throughput.
 /// Returns JSON with `speed_mbps`, `bytes_downloaded`, `duration_ms`, and
 /// `status` fields. On failure, returns `status: "failed"` with the error.
-#[tauri::command]
+
 pub async fn aerie_speed_test() -> Result<String, String> {
     let url = speed_test_url();
     let client = reqwest::Client::builder()

src-tauri/src/aerie/commands.rs src-gossamer/src/aerie/commands.rssrc-tauri/src/aerie/commands.rs renamed to src-gossamer/src/aerie/commands.rs

@@ -57,7 +57,7 @@ fn save_config(config: &AiProvidersFile) -> Result<(), String> {
 /// Returns the provider's response as a JSON-serialised `SendMessageResponse`.
 /// If the provider returns 429, the response has `quota_exhausted: true` and
 /// the frontend should retry with the next provider.
-#[tauri::command]
+
 pub async fn ai_send_message(request: SendMessageRequest) -> Result<String, String> {
     let config_file = load_config()?;
 
@@ -99,7 +99,7 @@ pub async fn ai_send_message(request: SendMessageRequest) -> Result<String, Stri
 ///
 /// Sends a minimal request to verify the API key works.
 /// Returns a JSON object with `{ "status": "ready"|"error"|"no_key", "detail": "..." }`.
-#[tauri::command]
+
 pub async fn ai_check_provider(provider_id: String) -> Result<String, String> {
     let config_file = load_config()?;
     let pid: ProviderId =
@@ -168,7 +168,7 @@ pub async fn ai_check_provider(provider_id: String) -> Result<String, String> {
 }
 
 /// Change the selected model for a provider.
-#[tauri::command]
+
 pub async fn ai_set_model(provider_id: String, model: String) -> Result<String, String> {
     let mut config_file = load_config()?;
     let pid: ProviderId =
@@ -188,7 +188,7 @@ pub async fn ai_set_model(provider_id: String, model: String) -> Result<String,
 }
 
 /// Change a provider's precedence ranking.
-#[tauri::command]
+
 pub async fn ai_set_priority(provider_id: String, priority: u32) -> Result<String, String> {
     let mut config_file = load_config()?;
     let pid: ProviderId =
@@ -208,7 +208,7 @@ pub async fn ai_set_priority(provider_id: String, priority: u32) -> Result<Strin
 }
 
 /// Enable or disable a provider (mute/unmute without losing the API key).
-#[tauri::command]
+
 pub async fn ai_toggle_provider(provider_id: String) -> Result<String, String> {
     let mut config_file = load_config()?;
     let pid: ProviderId =
@@ -231,7 +231,7 @@ pub async fn ai_toggle_provider(provider_id: String) -> Result<String, String> {
 /// Clear the conversation history. This is a frontend-only operation;
 /// this command exists as a hook for any backend cleanup needed later
 /// (e.g., clearing cached token counts).
-#[tauri::command]
+
 pub async fn ai_clear_history() -> Result<String, String> {
     Ok(serde_json::json!({ "cleared": true }).to_string())
 }
@@ -240,7 +240,7 @@ pub async fn ai_clear_history() -> Result<String, String> {
 ///
 /// Reads SCM files, AI manifest, detected languages, and assembles a
 /// structured context string for the AI system prompt.
-#[tauri::command]
+
 pub async fn ai_build_context(repo_path: String) -> Result<String, String> {
     let context_str = context::build_repo_context(&repo_path)?;
     Ok(serde_json::json!({ "context": context_str }).to_string())
@@ -250,7 +250,7 @@ pub async fn ai_build_context(repo_path: String) -> Result<String, String> {
 ///
 /// Returns the full `AiProvidersFile` as JSON. The frontend uses this
 /// to initialise the provider key ring on panel open.
-#[tauri::command]
+
 pub async fn ai_get_state() -> Result<String, String> {
     let config_file = load_config()?;
     serde_json::to_string(&config_file).map_err(|e| format!("Serialisation error: {e}"))
@@ -265,9 +265,9 @@ pub async fn ai_get_state() -> Result<String, String> {
 ///
 /// Returns `"streaming_started"` immediately. Errors during streaming are
 /// emitted as `StreamChunk::Error` events rather than returned here.
-#[tauri::command]
+
 pub async fn ai_send_message_streaming(
-    app_handle: tauri::AppHandle,
+    app_handle: crate::compat::AppHandle,
     request: StreamingRequest,
 ) -> Result<String, String> {
     let config_file = load_config()?;
@@ -312,7 +312,7 @@ pub async fn ai_send_message_streaming(
     let content = request.content.clone();
 
     // Spawn the streaming task so we can return immediately.
-    tauri::async_runtime::spawn(async move {
+    crate::compat::spawn_async(async move {
         let tools_ref = tools_owned.as_deref();
         let tool_results_ref = tool_results_owned.as_deref();
 
@@ -327,7 +327,7 @@ pub async fn ai_send_message_streaming(
         )
         .await
         {
-            use tauri::Emitter;
+            use crate::compat::Emitter;
             let _ = app_handle.emit(
                 "ai:stream-chunk",
                 &StreamChunk::Error(e),