v0.2.0

clean architecture refactor, performance, resilience, DX/UX

architecture:
- 13 crates with proper domain/application/infrastructure layers
- domain crate: newtypes, ports (Plugin, AppLauncher), constants
- kernel: pure orchestrator
- shared UI state machine (k-launcher-ui-core)
- merged plugin-api into domain as ports module
- granular file structure (no monolithic lib.rs)
- all tests extracted to tests/ directories

features:
- frecency boost in search results
- empty query shows top frecent apps
- append-only frecency log with configurable compaction
- config-driven styling (all colors, sizes, debounce)
- configurable terminal emulator, external plugin timeout
- log rotation with max_log_files
- loading indicator, descriptive placeholder text
- graceful shutdown via iced::exit() + Plugin::shutdown()
- --version flag, panic hook, signal handling (SIGINT/SIGTERM)
- SpawnInTerminal in external plugin protocol

performance:
- ~1500 -> ~50 heap allocs per keystroke
- reused Matcher, Pattern, char buffer across entries
- Arc<str> for shared result fields
- pre-filter before fuzzy matching
- partial sort for top frecent IDs
- cached lowercase names in entries

resilience:
- parking_lot (no mutex poisoning)
- thiserror hierarchy (PluginError, ConfigError, AppError)
- all silent error swallowing replaced with tracing::warn
- config parse errors logged

quality:
- named constants (no magic strings/numbers)
- named types (no anonymous tuples)
- Rgba newtype with validation
- domain newtype validation (debug_assert non-empty)
- man page, LICENSE (MIT), PKGBUILD, example config
- plugin development guide updated
- make check (fmt + clippy + test), make dev (RUST_LOG=debug)

style: format code for better readability in tests and function signatures

fix: update build_entries function signature to ignore frecency parameter

fix(review): bugs, arch violations, design smells

P1 bugs:
- unix_launcher: shell_split respects quoted args (was split_whitespace)
- plugin-host: 5s timeout on external plugin search
- ui: handle engine init panic, wire error state
- ui-egui: read window config instead of always using defaults
- plugin-url: use OpenPath action instead of SpawnProcess+xdg-open

Architecture:
- remove WindowConfig (mirror of WindowCfg); use WindowCfg directly
- remove on_select closure from SearchResult (domain leakage)
- remove LaunchAction::Custom; add Plugin::on_selected + SearchEngine::on_selected
- apps: record frecency via on_selected instead of embedded closure

Design smells:
- frecency: extract decay_factor helper, write outside mutex
- apps: remove cfg(test) cache_path hack; add new_for_test ctor
- apps: stable ResultId using name+exec to prevent collision
- files: stable ResultId using full path instead of index
- plugin-host: remove k-launcher-os-bridge dep (WindowConfig gone)

Update iced dependency in Cargo.toml to disable default features and add additional ones

feat(app): enhance engine initialization with EngineHandle and update run function signature

feat: production hardening (panic isolation, file logging, apps cache)

- Kernel::search wraps each plugin in catch_unwind; panics are logged and return []
- init_logging() adds daily rolling file at ~/.local/share/k-launcher/logs/
- AppsPlugin caches entries to ~/.cache/k-launcher/apps.bin via bincode; stale-while-revalidate on subsequent launches
- 57 tests pass

refactor: remove client module and associated show command logic

fix(app): format code for clarity in update function

chore: update .gitignore and enhance README with compositor setup instructions

chore(docs): remove unused screenshot file

feature/prod-ready (#1)

Reviewed-on: #1

fix(calc): remove ambiguous log alias, use ln/log2/log10 explicitly

fix(calc): fix log/ln naming, cache math context, strengthen sin(pi) test

feat(calc): add math functions (sqrt, sin, cos, etc.) and pi/e constants

refactor(calc): rename preprocess, extend underscore test assertions

feat(calc): strip underscore digit separators

feat: update dependencies for improved compatibility and performance

feat: add plugin-url for URL handling and open in browser functionality

feat: add support for external plugins and enhance plugin management

feat: add Makefile for build, run, and installation commands

feat: add required features for k-launcher-egui and update dependencies

feat: update README and add documentation for installation, configuration, usage, and plugin development

feat: enhance configuration management and UI styling, remove unused theme module

feat: add k-launcher-config crate for configuration management and integrate with existing components

feat: add k-launcher-ui-egui crate for enhanced UI

- Introduced a new crate `k-launcher-ui-egui` to provide a graphical user interface using eframe and egui.
- Updated the workspace configuration in `Cargo.toml` to include the new crate.
- Implemented the main application logic in `src/app.rs`, handling search functionality and user interactions.
- Created a library entry point in `src/lib.rs` to expose the `run` function for launching the UI.
- Modified the `k-launcher` crate to include a new binary target for the egui-based launcher.
- Added a new main file `src/main_egui.rs` to initialize and run the egui UI with the existing kernel and launcher components.

feat: implement OS bridge and enhance app launcher functionality

feat: add FilesPlugin for file searching and integrate into KLauncher

feat: implement frecency tracking for app usage and enhance search functionality

feat: add CmdPlugin for executing terminal commands and update workspace configuration

refactor: update dependencies and improve keyboard event handling in KLauncherApp

refactor: simplify theme usage and enhance AppsPlugin structure

feat: restructure k-launcher workspace and add core functionality

- Updated Cargo.toml to include a new k-launcher crate and reorganized workspace members.
- Introduced a README.md file detailing the project philosophy, architecture, and technical specifications.
- Implemented a new Kernel struct in k-launcher-kernel for managing plugins and search functionality.
- Created a Plugin trait for plugins to implement, allowing for asynchronous search operations.
- Developed k-launcher-ui with an Iced-based UI for user interaction, including search input and result display.
- Added AppsPlugin and CalcPlugin to handle application launching and basic calculations, respectively.
- Established a theme module for UI styling, focusing on an Aero aesthetic.
- Removed unnecessary main.rs files from plugin crates, streamlining the project structure.

Initialize k-launcher project structure with multiple crates and basic configurations

docs/plugin-development.md

@@ -35,6 +35,7 @@ The process is kept alive between queries — do **not** exit after each respons
 | `"type"` | Extra fields | Behavior |
 |----------|-------------|---------|
 | `SpawnProcess` | `"cmd"` | Launch process directly |
+| `SpawnInTerminal` | `"cmd"` | Run command in terminal emulator |
 | `CopyToClipboard` | `"text"` | Copy text to clipboard |
 | `OpenPath` | `"path"` | Open file/dir with xdg-open |
 
@@ -53,7 +54,8 @@ In `~/.config/k-launcher/config.toml`:
 [[plugins.external]]
 name = "my-plugin"
 path = "/usr/lib/k-launcher/plugins/my-plugin"
-args = []        # optional
+args = []           # optional
+timeout_secs = 5    # optional, default 5
 ```
 
 Multiple `[[plugins.external]]` blocks are supported.
@@ -96,7 +98,7 @@ for line in sys.stdin:
 
 ## Built-in Plugins (compiled-in)
 
-Built-in plugins implement the `Plugin` trait from `k-launcher-kernel` as Rust crates compiled into the binary.
+Built-in plugins implement the `Plugin` trait from `k-launcher-domain` as Rust crates compiled into the binary.
 
 ### 1. Create a new crate in the workspace
 
@@ -120,7 +122,7 @@ members = [
 
 ```toml
 [dependencies]
-k-launcher-kernel = { path = "../../k-launcher-kernel" }
+k-launcher-domain = { workspace = true }
 async-trait = "0.1"
 ```
 
@@ -129,8 +131,10 @@ async-trait = "0.1"
 `crates/plugins/plugin-hello/src/lib.rs`:
 
 ```rust
+use std::sync::Arc;
+
 use async_trait::async_trait;
-use k_launcher_kernel::{LaunchAction, Plugin, ResultId, ResultTitle, Score, SearchResult};
+use k_launcher_domain::{LaunchAction, Plugin, ResultId, ResultTitle, Score, SearchResult};
 
 pub struct HelloPlugin;
 
@@ -154,11 +158,10 @@ impl Plugin for HelloPlugin {
         vec![SearchResult {
             id: ResultId::new("hello:world"),
             title: ResultTitle::new("Hello, World!"),
-            description: Some("A greeting from the hello plugin".to_string()),
+            description: Some(Arc::from("A greeting from the hello plugin")),
             icon: None,
             score: Score::new(80),
             action: LaunchAction::CopyToClipboard("Hello, World!".to_string()),
-            on_select: None,
         }]
     }
 }
@@ -192,11 +195,10 @@ plugin-hello = { path = "../plugins/plugin-hello" }
 |-------|------|-------------|
 | `id` | `ResultId` | Unique stable ID (e.g. `"apps:firefox"`) |
 | `title` | `ResultTitle` | Primary display text |
-| `description` | `Option<String>` | Secondary line shown below title |
-| `icon` | `Option<String>` | Icon name or path (currently unused in renderer) |
+| `description` | `Option<Arc<str>>` | Secondary line shown below title |
+| `icon` | `Option<Arc<str>>` | Icon name or path (currently unused in renderer) |
 | `score` | `Score(u32)` | Sort priority — higher wins |
 | `action` | `LaunchAction` | What happens on `Enter` |
-| `on_select` | `Option<Arc<dyn Fn()>>` | Optional side-effect on selection (e.g. frecency bump) |
 
 ### `LaunchAction` Variants
 
@@ -206,7 +208,6 @@ plugin-hello = { path = "../plugins/plugin-hello" }
 | `SpawnInTerminal(String)` | Run command inside a terminal emulator |
 | `OpenPath(String)` | Open a file or directory with `xdg-open` |
 | `CopyToClipboard(String)` | Copy text to clipboard |
-| `Custom(Arc<dyn Fn()>)` | Arbitrary closure |
 
 ### Scoring Guidance