feat(picker2): complete Picker2 prototype

Picker2 replaces the original Picker1 with a two-phase (tag → pick) +
mask-bitmap architecture, decoupling argument matching from type
conversion via a composable matcher pipeline.

Architecture
- FlagMatcher — boolean flags (--verbose)
- ArgMatcher — single flag+value pairs (--name Alice)
- MultiArgMatcher — multi-value flag groups (--files a.txt b.txt)
- PositionalMatcher — positional arguments, respects `--`
- SingleMatcher — composite for Single-type Pickables

Types
- Flag (Active/Inactive) — semantic bool flag value
- String + 14 numeric types via SinglePickable trait
- Vec<T> — greedy multi-value (all SinglePickable types)
- VecUntil<T> — bounded multi-value via BoundaryCheck trait
- VecUntil<T>, pick_string, pick_numbers, pick_bool, pick_flag

Style system
- UNIX_STYLE (kebab), POWERSHELL_STYLE (Pascal), WINDOWS_STYLE (Pascal)
- naming_case auto-conversion via just_fmt integration
- Style-aware separator (= for Unix, : for PS/Windows)

Infrastructure
- internal_repeat! macro generates PickerPattern1..=32
- SinglePickable blanket impl → Pickable
- MultiPickableWithBoundary trait with greedy/bounded variants
- 151 integration tests
- Docs updated for parser feature

1 files changed, 56 insertions, 0 deletions

diff --git a/mingling_picker/src/picker/result.rs b/mingling_picker/src/picker/result.rs
new file mode 100644
index 0000000..9cd78ae
--- /dev/null
+++ b/mingling_picker/src/picker/result.rs
@@ -0,0 +1,56 @@
+#![allow(clippy::type_complexity)] // Aha, Type Gymnastics!
+
+use mingling_picker_macros::internal_repeat;
+
+internal_repeat!(1..=32 => {
+    #[doc(hidden)]
+    pub struct PickerResult$<(T$,+), Route> {
+        /// The route selected by the picker, if any.
+        /// If this is `Some`, the picker chose to follow a route instead of selecting values,
+        /// and all value fields (`v1`, `v2`, ...) will be `None`.
+        ///
+        /// Note: "route" here refers to an alternative path/choice, not a network route.
+        pub route: Option<Route>,
+
+        (
+            #[doc = concat!("The optional value for the ", $, "th type parameter.")]
+            pub v$: Option<T$>,
+        +)
+    }
+});
+
+internal_repeat!(1..=32 => {
+    impl<(T$,+), Route> PickerResult$<(T$,+), Route> {
+        /// Unwraps the result, panicking if a route was selected.
+        ///
+        /// # Panics
+        ///
+        /// Panics if `self.route` is `Some(...)`.
+        pub fn unwrap(self) -> ((T$,+)) {
+            ((self.v$.unwrap(),+))
+        }
+
+        /// Returns the individual option values without checking the route.
+        pub fn unpack(self) -> ((Option<T$>,+)) {
+            ((self.v$,+))
+        }
+
+        /// Converts to a `Result`, returning `Err(route)` if a route was selected,
+        /// or `Ok(values)` otherwise.
+        pub fn to_result(self) -> Result<((T$,+)), Route> {
+            if let Some(r) = self.route {
+                return Err(r);
+            }
+            Ok(self.unwrap())
+        }
+
+        /// Converts to an `Option`, returning `None` if a route was selected,
+        /// or `Some(values)` otherwise.
+        pub fn to_option(self) -> Option<((T$,+))> {
+            if let Some(_) = self.route {
+                return None;
+            }
+            Some(self.unwrap())
+        }
+    }
+});