fix(profiling): resolve clippy unwrap_used and rustfmt doc comment formatting

Replace unwrap() with ok_or_else() for string_storage access in
add_string_id_sample and reflow doc comments to satisfy rustfmt.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: realFlowControl

libdd-profiling-ffi/src/profiles/datatypes.rs

@@ -585,9 +585,9 @@ impl From<ProfileNewResult> for Result<Profile, Error> {
 /// This call is _NOT_ thread-safe.
 ///
 /// # Arguments
-/// * `track_ptr` - If non-zero, also track this allocation for heap-live
-///   profiling. The sample data is copied into owned storage and will be
-///   automatically injected during profile reset. Use 0 to skip tracking.
+/// * `track_ptr` - If non-zero, also track this allocation for heap-live profiling. The sample data
+///   is copied into owned storage and will be automatically injected during profile reset. Use 0 to
+///   skip tracking.
 #[must_use]
 #[no_mangle]
 pub unsafe extern "C" fn ddog_prof_Profile_add(
@@ -949,8 +949,8 @@ pub unsafe extern "C" fn ddog_prof_Profile_reset(profile: *mut Profile) -> Profi
 /// # Arguments
 /// * `profile` - A mutable reference to the profile.
 /// * `max_tracked` - Maximum number of allocations to track simultaneously.
-/// * `excluded_labels` - Label keys to strip from tracked allocations
-///   (e.g., high-cardinality labels like "span id").
+/// * `excluded_labels` - Label keys to strip from tracked allocations (e.g., high-cardinality
+///   labels like "span id").
 /// * `excluded_labels_len` - Number of elements in `excluded_labels`.
 /// * `alloc_size_idx` - Index of alloc-size in the sample values array.
 /// * `heap_live_samples_idx` - Index of heap-live-samples in the sample values array.

libdd-profiling/src/internal/profile/mod.rs

@@ -302,7 +302,11 @@ impl Profile {
         // and copy sample data into owned storage before interning.
         if let Some(ptr) = track_ptr {
             if let Some(hl) = self.heap_live.as_mut() {
-                let storage = self.string_storage.as_ref().unwrap();
+                let storage = self.string_storage.as_ref().ok_or_else(|| {
+                    anyhow::anyhow!(
+                        "string storage required for heap-live tracking with string IDs"
+                    )
+                })?;
                 let locked = storage
                     .lock()
                     .map_err(|_| anyhow::anyhow!("string storage lock was poisoned"))?;
@@ -388,8 +392,8 @@ impl Profile {
     ///
     /// # Arguments
     /// * `max_tracked` - Maximum number of allocations to track simultaneously
-    /// * `excluded_labels` - Label keys to strip when copying into the tracker
-    ///   (e.g., high-cardinality labels like "span id", "trace id")
+    /// * `excluded_labels` - Label keys to strip when copying into the tracker (e.g.,
+    ///   high-cardinality labels like "span id", "trace id")
     pub fn enable_heap_live_tracking(
         &mut self,
         max_tracked: usize,