feat: simple sensor panels with file-based data source (#7)

* add simulation mode for easier development

* improved sensor file watcher, poc cpu & mem usage

Trigger file read by rename event

* feat: system information sensor tool

Gather various sensor values with the sysinfo crate:
https://github.com/GuillaumeGomez/sysinfo
Values can be written to a sensor source file with the `--out` cmd line
option for the `asterctl` tool.

* ci: build sysinfo tool and include in build artifact

* feat: support integerDigits, decimalDigits sensor value format options

* docs: update documentation

Closes #6

Cargo.toml

@@ -13,17 +13,33 @@ strip = true  # Automatically strip symbols from the binary.
 name = "asterctl"
 path = "src/main.rs"
 
+[[bin]]
+name = "sysinfo"
+path = "src/bin/sysinfo.rs"
+required-features = ["sysinfo"]
+
+[features]
+sysinfo = ["dep:sysinfo"]
+
 [dependencies]
 anyhow = "1.0.98"
 bytes = "1.10.1"
-clap = { version = "4.5.41", features = ["derive"] }
+clap = { version = "4.5.42", features = ["derive"] }
 serialport = "4.7.2"
 image = "0.25.6"
 imageproc = { version = "0.25.0", default-features = false }
-ab_glyph = { version = "0.2.23", default-features = false, features = ["std"] }
+ab_glyph = { version = "0.2.31", default-features = false, features = ["std"] }
 log = "0.4.27"
 env_logger = "0.11.8"
+notify = "8.2.0"
+regex = "1.11"
 serde = { version = "1.0.219", features = ["derive"] }
-serde_json = "1.0.141"
+serde_json = "1.0.142"
 serde_repr = "0.1.20"
 once_cell = "1.21.3"
+sysinfo = {  version = "0.37.0", optional = true }
+itertools = "0.14"
+tempfile = "3"
+
+[dev-dependencies]
+rstest = "0.26"