fix(clippy): bring source under -D warnings ahead of CI

Prep for the Forgejo CI gate. Adjustments per module are small
and local:

  - test modules get inner `#![allow(clippy::unwrap_used,
    expect_used, panic)]` so the existing assert.expect()
    test idiom keeps working without rewriting every fixture
  - the dead_code field that downstream consumers may still
    want serialised gets an explicit #[allow(dead_code)]
  - manual char/range comparisons fold to the idiomatic forms
    (`['…']`, `(2..=5).contains(&n)`)
  - one snake_case rename in text-readability-score

Also re-bakes module.wasm so the committed artefact matches
the post-fmt source byte-for-byte.

No behaviour change, no test change. cargo fmt --all -- --check
and cargo clippy --all-targets -- -D warnings now both pass.

Signed-off-by: flemming-it <sf@flemming.it>

src/lib.rs

@@ -57,9 +57,7 @@ pub fn invoke(_ctx: Context, inputs: Inputs) -> Result<Outputs, ModuleError> {
 
     for d in &input.duties {
         if d.frequency < 0.0 || d.tariff_eur_per_hour < 0.0 || d.time_hours_per_case < 0.0 {
-            return Err(ModuleError::invalid_input(
+            return Err(ModuleError::invalid_input("negative P/F/T/h not allowed"));
-                "negative P/F/T/h not allowed",
-            ));
         }
         let value = d.population as f64
             * d.frequency as f64
@@ -84,7 +82,11 @@ pub fn invoke(_ctx: Context, inputs: Inputs) -> Result<Outputs, ModuleError> {
         total += value;
     }
 
-    let r = Report { items, total_eur_per_year: total, tier_lowest };
+    let r = Report {
+        items,
+        total_eur_per_year: total,
+        tier_lowest,
+    };
     Outputs::new().with_json("report", &r)
 }
 
@@ -97,11 +99,16 @@ fn lower_tier(a: &str, b: &str) -> String {
         "T3" => 3,
         _ => 4,
     };
-    if rank(b) > rank(a) { b.to_string() } else { a.to_string() }
+    if rank(b) > rank(a) {
+        b.to_string()
+    } else {
+        a.to_string()
+    }
 }
 
 #[cfg(test)]
 mod tests {
+    #![allow(clippy::unwrap_used, clippy::expect_used, clippy::panic)]
     use super::*;
 
     #[test]
@@ -155,6 +162,10 @@ mod tests {
                 tier: t,
             });
         }
-        Ok(Report { items, total_eur_per_year: total, tier_lowest: tier })
+        Ok(Report {
+            items,
+            total_eur_per_year: total,
+            tier_lowest: tier,
+        })
     }
 }