refactor: move firmware workspace under firmware

firmware/libs/kaptan-flight-config/src/profile/observability.rs

@@ -0,0 +1,35 @@
+//! Persisted, restart-only runtime-observability policy.
+
+use kaptan_config::ConfigValidate;
+
+/// Candidate-only observability policy. It deliberately controls only optional
+/// detail; error-level records are never suppressible configuration fields.
+#[derive(Clone, Copy, ConfigValidate)]
+pub(super) struct ObservabilityCandidate {
+    #[config(
+        id = 24,
+        key = "observability.maximum_log_level",
+        unit = "mav_severity",
+        default = 6,
+        range(min = 3, max = 7)
+    )]
+    pub(super) maximum_log_level: u32,
+}
+
+/// Immutable boot-active best-effort observability policy.
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub struct ObservabilitySettings {
+    maximum_log_level: u32,
+}
+
+impl ObservabilitySettings {
+    pub(crate) const fn new(maximum_log_level: u32) -> Self {
+        Self { maximum_log_level }
+    }
+
+    /// Maximum best-effort MAVLink severity: Error (3) through Debug (7).
+    /// This never filters error-level records.
+    pub const fn maximum_log_level(self) -> u32 {
+        self.maximum_log_level
+    }
+}