chore: justify the remaining keep-only cast + serde-default allows with reasons

hive-bash-mcp/src/bin/mcp.rs

@@ -168,7 +168,10 @@ struct BashRunArgs {
     wait_seconds: Option<u64>,
 }
 
-#[allow(clippy::unnecessary_wraps)]
+#[allow(
+    clippy::unnecessary_wraps,
+    reason = "serde `#[serde(default = ...)]` requires the default fn's return type to match the field's `Option<u64>`, so the `Some` wrap is mandatory even though the value is constant"
+)]
 fn default_wait() -> Option<u64> {
     Some(3)
 }

hive-c0re/src/hive_stats.rs

@@ -167,7 +167,11 @@ fn now_secs() -> i64 {
         .map_or(0, |d| i64::try_from(d.as_secs()).unwrap_or(i64::MAX))
 }
 
-#[allow(clippy::cast_sign_loss, clippy::cast_possible_truncation)]
+#[allow(
+    clippy::cast_sign_loss,
+    clippy::cast_possible_truncation,
+    reason = "v.max(0) clamps to a non-negative value first, so the i64->u64 cast is exact: no sign loss, and no truncation since u64 covers all non-negative i64"
+)]
 fn u64_from_i64(v: i64) -> u64 {
     v.max(0) as u64
 }

hive-forge/src/verbs/comments.rs

@@ -99,7 +99,10 @@ fn fetch_head(client: &Client, repo: &str, number: u64, limit: u64) -> Result<Ve
 /// first to know how many exist, then start paginating from the
 /// page that contains item `total - n`. Work is bounded by
 /// `ceil(n/50) + 1` page fetches, regardless of thread length.
-#[allow(clippy::cast_possible_truncation)]
+#[allow(
+    clippy::cast_possible_truncation,
+    reason = "the forge `comments` count cast to usize is a small issue-thread length, never anywhere near usize::MAX even on a 32-bit target, so it cannot truncate in practice"
+)]
 fn fetch_tail(client: &Client, repo: &str, number: u64, n: usize) -> Result<Vec<Value>> {
     if n == 0 {
         return Ok(Vec::new());