style: format the whole tree with cargo fmt (stock defaults, #35)

One-time, mechanical reformat — no functional changes. The tree was not
rustfmt-clean (~1800 hunks across ~100 files); this brings it to stock
`cargo fmt` defaults so a `cargo fmt --check` CI gate can follow.
Behaviour-preserving: 2509 pass / 0 fail / 1 ignored (unchanged baseline),
clippy clean. A .git-blame-ignore-revs entry follows so `git blame`
skips this commit.

src/dsl/sql_functions.rs

@@ -43,29 +43,9 @@
 /// - **Broader scalars:** `date`, `datetime`, `hex`, `ifnull`,
 ///   `instr`, `nullif`, `random`, `replace`, `strftime`, `typeof`.
 pub const KNOWN_SQL_FUNCTIONS: &[&str] = &[
-    "abs",
-    "avg",
-    "coalesce",
-    "count",
-    "date",
-    "datetime",
-    "hex",
-    "ifnull",
-    "instr",
-    "length",
-    "lower",
-    "max",
-    "min",
-    "nullif",
-    "random",
-    "replace",
-    "round",
-    "strftime",
-    "substr",
-    "sum",
-    "trim",
-    "typeof",
-    "upper",
+    "abs", "avg", "coalesce", "count", "date", "datetime", "hex", "ifnull", "instr", "length",
+    "lower", "max", "min", "nullif", "random", "replace", "round", "strftime", "substr", "sum",
+    "trim", "typeof", "upper",
 ];
 
 /// Whether `partial` is a case-insensitive prefix of at least one
@@ -80,9 +60,7 @@ pub const KNOWN_SQL_FUNCTIONS: &[&str] = &[
 #[must_use]
 pub fn is_known_function_prefix(partial: &str) -> bool {
     let lowered = partial.to_lowercase();
-    KNOWN_SQL_FUNCTIONS
-        .iter()
-        .any(|f| f.starts_with(&lowered))
+    KNOWN_SQL_FUNCTIONS.iter().any(|f| f.starts_with(&lowered))
 }
 
 #[cfg(test)]