Trim comments across Rust and webapp source to direct one-liners (ticket 030)

Pass over src/*.rs, webapp/src/**, and the in-app "?" docs prose:
condensed multi-paragraph doc comments to single lines that state the
non-obvious why, deleted comments that only restated adjacent code, and
tightened the Docs.tsx help-panel wording. No logic, structure, or code
formatting changed — verified via cargo test (143 passed) and
tsc -b && vite build.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XFUNZwCvz3kcod3352ZR2o

src/data_value.rs

@@ -3,19 +3,13 @@ use crate::timestamp::Timestamp;
 use serde::{Deserialize, Serialize};
 use std::collections::BTreeMap;
 
-/// A single parsed metric primitive extracted from a regex capture group.
 #[allow(dead_code)]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct RegexToMetricPrimitiveMatcher {
     pub param_name: String,
     pub capture_group: String,
     pub kind: MetricPrimitiveKind,
-    /// Ticket 022: whether this param contributes to the bucket's `labels`
-    /// (the default) or is the bucket's per-event captured `value` (at most
-    /// one `Value`-role param per metric — `declare_metric` rejects more
-    /// than one). `#[serde(default)]` so profile files saved before this
-    /// field existed still load, with every param defaulting to `Label` —
-    /// i.e. unchanged behavior (the fixed occurrence-count-of-1 value).
+    /// Whether this param is a bucket label or its captured value (at most one Value-role param per metric); `#[serde(default)]` so profile files saved before this field existed still load as `Label`.
     #[serde(default)]
     pub role: ParamRole,
 }
@@ -29,10 +23,7 @@ pub enum ParamRole {
     Value,
 }
 
-/// `rename_all = "lowercase"` matches every other `kind`-style enum exposed
-/// over the API/settings JSON (`ColorScheme`, `CssEntryKind`,
-/// `ProfileMetricPrimitiveKind`), so `POST /api/params`/`POST /api/metrics`
-/// bodies use `"string"`/`"number"`/`"timestamp"`.
+/// `rename_all = "lowercase"` matches other `kind`-style enums, so JSON bodies use "string"/"number"/"timestamp".
 #[allow(dead_code)]
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "lowercase")]
@@ -40,12 +31,7 @@ pub enum MetricPrimitiveKind {
     String,
     Number,
     Timestamp,
-    /// Ticket 023: milliseconds. On a metric's `Value`-role param, this
-    /// doesn't parse the captured text at all — the value is instead derived
-    /// as the elapsed time since the previous counter event with the same
-    /// label set (see `crate::engine::apply_metric_to_log`). On any other
-    /// param (a `Label`-role metric param, or a standalone `ParamDeclaration`),
-    /// it parses the captured text as a literal `i64` millisecond count.
+    /// On a Value-role param this is derived as elapsed time since the previous event (not parsed from text); otherwise it's a literal i64 millisecond count.
     Duration,
 }
 
@@ -65,16 +51,16 @@ pub enum DataValue {
     MetricDeclaration {
         message_match_regex: String,
         params: Vec<RegexToMetricPrimitiveMatcher>,
-        /// See `crate::engine::DeclareMetricRequest::matched_labels` (ticket 025).
+        /// See `crate::engine::DeclareMetricRequest::matched_labels`.
         matched_labels: Option<BTreeMap<String, String>>,
-        /// See `crate::engine::DeclareMetricRequest::unmatched_labels` (ticket 025).
+        /// See `crate::engine::DeclareMetricRequest::unmatched_labels`.
         unmatched_labels: Option<BTreeMap<String, String>>,
     },
     /// Paired with `IndexKey::Bucket`.
     BucketValue {
         values: Vec<(u64, Timestamp, MetricPrimitive)>,
     },
-    /// Paired with `IndexKey::LastMetricEvent` (ticket 023).
+    /// Paired with `IndexKey::LastMetricEvent`.
     LastEventTimestamp {
         timestamp: Timestamp,
     },