feat: enhance agent personality, tool guidance, and memory hygiene

- Expand communication style presets (professional, expressive, custom)
- Enrich SOUL.md with human-like tone and emoji-awareness guidance
- Add crash recovery and sub-task scoping guidance to AGENTS.md scaffold
- Add 'Use when / Don't use when' guidance to TOOLS.md and runtime prompts
- Implement memory hygiene system with configurable archiving and retention
- Add MemoryConfig options: hygiene_enabled, archive_after_days, purge_after_days, conversation_retention_days
- Archive old daily memory and session files to archive subdirectories
- Purge old archives and prune stale SQLite conversation rows
- Add comprehensive tests for new features

Cargo.toml

@@ -15,7 +15,7 @@ categories = ["command-line-utilities", "api-bindings"]
 clap = { version = "4.5", features = ["derive"] }
 
 # Async runtime - feature-optimized for size
-tokio = { version = "1.42", default-features = false, features = ["rt-multi-thread", "macros", "time", "net", "io-util", "sync", "process", "io-std", "fs"] }
+tokio = { version = "1.42", default-features = false, features = ["rt-multi-thread", "macros", "time", "net", "io-util", "sync", "process", "io-std", "fs", "signal"] }
 
 # HTTP client - minimal features
 reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls", "blocking"] }
@@ -49,6 +49,7 @@ async-trait = "0.1"
 # Memory / persistence
 rusqlite = { version = "0.32", features = ["bundled"] }
 chrono = { version = "0.4", default-features = false, features = ["clock", "std"] }
+cron = "0.12"
 
 # Interactive CLI prompts
 dialoguer = { version = "0.11", features = ["fuzzy-select"] }