finish lua runtime makeover

- new multi-tool registration via ToolSource
- thread per source-or-standalone-tool
- switched to zig 0.16 Io threading interface
- cli: include `luv` package and run concurrent lua tools via libuv
- one single long-lived lua_State for the whole cli program

1 files changed, 15 insertions, 4 deletions

diff --git a/src/main.zig b/src/main.zig
index 56ea2ad..a752a12 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -2,7 +2,7 @@ const std = @import("std");
 const panto = @import("panto");
 const ping_tool = @import("ping_tool.zig");
 const lua_bridge = @import("lua_bridge.zig");
-const lua_tool = @import("lua_tool.zig");
+const lua_runtime = @import("lua_runtime.zig");
 const extension_loader = @import("extension_loader.zig");
 
 // Shorthand alias for the Lua C API. The bridge module owns the actual
@@ -12,7 +12,7 @@ const lua = lua_bridge.c;
 test {
     std.testing.refAllDecls(@This());
     _ = lua_bridge;
-    _ = lua_tool;
+    _ = lua_runtime;
     _ = extension_loader;
 }
 
@@ -220,13 +220,20 @@ pub fn main(init: std.process.Init) !void {
     try conv.addSystemMessage("You are a helpful assistant.");
 
     const prov = try panto.provider.Provider.init(alloc, io, config);
-    var agent = panto.agent.Agent.init(alloc, prov);
+    var agent = panto.agent.Agent.init(alloc, io, prov);
     defer agent.deinit();
 
     // smoke test: register a trivial built-in tool so we can exercise
     // the tool-call loop against a real LLM.
     try agent.registerTool(ping_tool.tool());
 
+    // Spin up the long-lived Lua runtime. All Lua extensions load into
+    // one `lua_State`; module-global state survives across calls. The
+    // runtime registers with the agent as a single `ToolSource` named
+    // `panto-lua`.
+    var rt = try lua_runtime.LuaRuntime.create(alloc);
+    defer rt.deinit();
+
     // Discover Lua extensions from $XDG_CONFIG_HOME/panto/extensions (or
     // $HOME/.config/panto/extensions) and ./.panto/extensions. Project
     // entries shadow user entries with the same name; tool-name collisions
@@ -235,13 +242,17 @@ pub fn main(init: std.process.Init) !void {
         alloc,
         io,
         init.environ_map,
-        &agent.registry,
+        rt,
     ) catch |err| {
         std.log.err("extension discovery failed: {t}", .{err});
         return err;
     };
     std.log.debug("extensions: {d} tool(s) registered", .{n_ext_tools});
 
+    if (n_ext_tools > 0) {
+        try agent.registerToolSource(rt.toolSource());
+    }
+
     const banner_model: []const u8 = switch (config) {
         inline else => |c| c.model,
     };