📚 docs: add missing READMEs and align crates with Rust rules

- Create README.md for paracas-daemon and paracas-estimate
- Add #![doc = include_str!("../README.md")] to daemon/estimate lib.rs
- Add missing Cargo.toml metadata (docs.rs, authors, keywords, categories)
- Reorder workspace dependencies by line length per style guide
- Document background jobs, download-all, status, and job commands

crates/paracas-daemon/README.md

@@ -0,0 +1,42 @@
+# paracas-daemon
+
+Background job management for the paracas tick data downloader.
+
+## Features
+
+- Job tracking with unique identifiers
+- Persistent state storage
+- Detached daemon process spawning
+- Thread-safe progress tracking
+
+## Types
+
+- `JobId` - Unique identifier for download jobs
+- `JobStatus` - Current status of a job (pending, running, completed, failed)
+- `InstrumentTask` - Download task for a single instrument
+- `DownloadJob` - Complete download job with multiple tasks
+- `StateManager` - Persistent state storage and retrieval
+- `DaemonSpawner` - Spawns detached daemon processes
+- `DaemonProgress` - Thread-safe progress tracking
+
+## Usage
+
+```rust,ignore
+use paracas_daemon::{StateManager, DownloadJob, JobId, JobStatus};
+
+// Create a state manager
+let manager = StateManager::new()?;
+
+// Create a new job
+let job = DownloadJob::new(tasks);
+manager.save_job(&job)?;
+
+// Retrieve job status
+if let Some(job) = manager.get_job(&job.id)? {
+    println!("Job status: {:?}", job.status());
+}
+```
+
+## License
+
+MIT License - see [LICENSE](../../LICENSE) for details.