chore: add code optimization plan

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

PLAN.md

@@ -0,0 +1,111 @@
+# Code Optimization Plan
+
+This document outlines planned optimizations to reduce boilerplate code and improve maintainability through the use of derive macros and utility crates.
+
+## 1. Add Utility Crates to Cargo.toml
+
+**Files affected:**
+- `Cargo.toml`
+
+**Changes:**
+- Add `thiserror` for streamlined error handling
+- Add `derive_more` for automatic trait implementations
+
+## 2. Replace Manual Debug Implementations with Derives
+
+**Files affected:**
+- `src/meta_plugin/digest.rs` - Hasher enum
+- `src/meta_plugin/command.rs` - MetaPluginCommand struct
+- Various other structs that manually implement Debug
+
+**Changes:**
+- Replace manual `fmt::Debug` implementations with `#[derive(Debug)]`
+- Remove redundant debug formatting code
+
+## 3. Replace Manual Default Implementations with Derives
+
+**Files affected:**
+- `src/meta_plugin/hostname.rs` - HostnameMetaPlugin
+- `src/meta_plugin/read_time.rs` - ReadTimeMetaPlugin  
+- `src/meta_plugin/read_rate.rs` - ReadRateMetaPlugin
+- `src/meta_plugin/shell.rs` - ShellMetaPlugin
+- `src/meta_plugin/shell_pid.rs` - ShellPidMetaPlugin
+- `src/meta_plugin/keep_pid.rs` - KeepPidMetaPlugin
+- `src/meta_plugin/user.rs` - UserMetaPlugin
+
+**Changes:**
+- Use `#[derive(Default)]` where appropriate
+- Use `#[derive(SmartDefault)]` from smart-default for complex defaults
+- Remove manual Default implementations
+
+## 4. Use thiserror for Error Types
+
+**Files affected:**
+- `src/modes/server/mcp/tools.rs` - ToolError enum
+- `src/services/error.rs` - CoreError enum (already uses thiserror, check for consistency)
+- Any other custom error types
+
+**Changes:**
+- Replace manual Error trait implementations with `#[derive(thiserror::Error)]`
+- Use `#[from]` attribute for automatic From implementations
+- Ensure consistent error message formatting
+
+## 5. Use derive_more for Common Trait Implementations
+
+**Files affected:**
+- Types that wrap other types and need common trait implementations like:
+  - `Display`, `From`, `Into`, `Deref`, `DerefMut`
+- Specifically look for wrapper types that could benefit from:
+  - `derive_more::Display`
+  - `derive_more::From`
+  - `derive_more::Into`
+  - `derive_more::Deref`
+  - `derive_more::DerefMut`
+
+## 6. Enhance Serde Usage
+
+**Files affected:**
+- Response types in `src/modes/server/common.rs`
+- Configuration types throughout the codebase
+- Any structs that manually implement serialization/deserialization
+
+**Changes:**
+- Ensure consistent use of `#[derive(Serialize, Deserialize)]`
+- Use serde attributes for customization instead of manual implementations
+- Standardize field naming conventions
+
+## 7. Improve Strum Usage for Enums
+
+**Files affected:**
+- Enum types that have string conversions throughout the codebase
+- `src/compression_engine.rs` - CompressionType
+- `src/meta_plugin/mod.rs` - MetaPluginType
+
+**Changes:**
+- Use `strum` macros consistently for enum string conversions
+- Replace manual `to_string()` implementations with derives
+- Ensure all enum variants are properly handled
+
+## 8. Code Organization Improvements
+
+**Files affected:**
+- All source files
+
+**Changes:**
+- Group derives consistently at the top of struct/enum definitions
+- Standardize import ordering (std, external, internal)
+- Ensure consistent use of utility crates across the codebase
+
+## Implementation Priority
+
+1. **High Priority**: Add crates to Cargo.toml and fix compilation issues
+2. **Medium Priority**: Error handling improvements with thiserror
+3. **Medium Priority**: Debug and Default derive implementations  
+4. **Low Priority**: derive_more and other quality-of-life improvements
+
+## Testing Strategy
+
+- Run tests after each major change category
+- Ensure no functionality is broken by derive replacements
+- Verify error messages remain clear and informative
+- Check that serialization/deserialization behavior is preserved