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, 10 insertions, 5 deletions

diff --git a/mingling/Cargo.toml b/mingling/Cargo.toml
index 667cfa5..c3f9511 100644
--- a/mingling/Cargo.toml
+++ b/mingling/Cargo.toml
@@ -22,29 +22,35 @@ mingling = { path = ".", features = [
 
 [package.metadata.docs.rs]
 features = [
+    "core",
+    "macros",
     "builds",
     "structural_renderer",
     "repl",
     "comp",
     "parser",
+    "picker",
     "clap",
     "extra_macros",
 ]
 
 [features]
+core = ["dep:mingling_core", "mingling_core/default"]
+macros = ["dep:mingling_macros", "mingling_macros/default"]
+
 nightly = ["mingling_core/nightly", "mingling_macros/nightly"]
 debug = ["mingling_core/debug"]
 async = ["mingling_core/async", "mingling_macros/async"]
 builds = ["mingling_core/builds"]
 
-default = ["mingling_core/default", "mingling_macros/default"]
+default = ["core", "macros"]
 
 clap = ["mingling_core/clap", "mingling_macros/clap"]
 dispatch_tree = ["mingling_core/dispatch_tree", "mingling_macros/dispatch_tree"]
 repl = ["mingling_core/repl", "mingling_macros/repl"]
 comp = ["mingling_core/comp", "mingling_macros/comp"]
 parser = ["dep:size"]
-picker = ["dep:mingling_picker", "dep:mingling_picker_macros"]
+picker = ["dep:mingling_picker", "mingling_picker/mingling_support"]
 pathf = ["mingling_core/pathf", "mingling_macros/pathf"]
 
 structural_renderer = [
@@ -82,9 +88,8 @@ ron_serde_fmt = ["mingling_core/ron_serde_fmt"]
 extra_macros = ["mingling_macros/extra_macros"]
 
 [dependencies]
-mingling_core.workspace = true
-mingling_macros.workspace = true
+mingling_core = { workspace = true, optional = true }
+mingling_macros = { workspace = true, optional = true }
 mingling_picker = { workspace = true, optional = true }
-mingling_picker_macros = { workspace = true, optional = true }
 serde = { workspace = true, optional = true }
 size = { version = "0.5", optional = true }