feat(logging): use local timezone for log timestamps

Replace default UTC timer with ChronoLocal::rfc_3339() so daemon and
CLI log lines display the operator's local time, making correlation
with external events easier.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -6639,6 +6639,7 @@ version = "0.3.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2f30143827ddab0d256fd843b7a66d164e9f271cfa0dde49142c5ca0ca291f1e"
 dependencies = [
+ "chrono",
  "matchers",
  "nu-ansi-term",
  "once_cell",

Cargo.toml

@@ -46,7 +46,7 @@ schemars = "1.2"
 
 # Logging - minimal
 tracing = { version = "0.1", default-features = false }
-tracing-subscriber = { version = "0.3", default-features = false, features = ["fmt", "ansi", "env-filter"] }
+tracing-subscriber = { version = "0.3", default-features = false, features = ["fmt", "ansi", "env-filter", "chrono"] }
 
 # Observability - Prometheus metrics
 prometheus = { version = "0.14", default-features = false }

src/main.rs

@@ -713,6 +713,7 @@ async fn main() -> Result<()> {
 
     // Initialize logging - respects RUST_LOG env var, defaults to INFO
     let subscriber = fmt::Subscriber::builder()
+        .with_timer(tracing_subscriber::fmt::time::ChronoLocal::rfc_3339())
         .with_env_filter(
             EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info")),
         )