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, 14 insertions, 0 deletions

diff --git a/docs/dev/pages/issues/add-picker2.md b/docs/dev/pages/issues/add-picker2.md
index 1f0f941..f5c3ca7 100644
--- a/docs/dev/pages/issues/add-picker2.md
+++ b/docs/dev/pages/issues/add-picker2.md
@@ -84,3 +84,17 @@ pub struct PickerResult<Tuple> {
     pub remains_argument: Arguments,
 }
 ```
+ 
+---
+
+## 🕘 Progress
+
+- [x] In Progress
+  - [x] Added `Picker` struct and related call chain
+  - [x] Added `parselib` providing parsing logic
+  - [x] Added `Pickable` for extensibility
+  - [ ] Comprehensive testing!
+  - [ ] Improve documentation
+  - [ ] Add examples
+  - [ ] Update README
+- [ ] Complete