feat(experts): add built-in expert skills with per-agent activation

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

src-tauri/Cargo.lock

@@ -867,6 +867,8 @@ dependencies = [
  "futures",
  "futures-util",
  "image",
+ "include_dir",
+ "junction",
  "keyring",
  "kill_tree",
  "mac-notification-sys",
@@ -883,6 +885,7 @@ dependencies = [
  "sea-orm-migration",
  "serde",
  "serde_json",
+ "sha2",
  "tar",
  "tauri",
  "tauri-build",
@@ -2597,6 +2600,25 @@ dependencies = [
  "png 0.18.1",
 ]
 
+[[package]]
+name = "include_dir"
+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "923d117408f1e49d914f1a379a309cffe4f18c05cf4e3d12e613a15fc81bd0dd"
+dependencies = [
+ "include_dir_macros",
+]
+
+[[package]]
+name = "include_dir_macros"
+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7cab85a7ed0bd5f0e76d93846e0147172bed2e2d3f859bcc33a8d9699cad1a75"
+dependencies = [
+ "proc-macro2",
+ "quote",
+]
+
 [[package]]
 name = "indexmap"
 version = "1.9.3"
@@ -2831,6 +2853,16 @@ dependencies = [
  "serde_json",
 ]
 
+[[package]]
+name = "junction"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8cfc352a66ba903c23239ef51e809508b6fc2b0f90e3476ac7a9ff47e863ae95"
+dependencies = [
+ "scopeguard",
+ "windows-sys 0.61.2",
+]
+
 [[package]]
 name = "keyboard-types"
 version = "0.7.0"