fix(regex): advance native Joni pattern semantics

docs/reference/feature-matrix.md

@@ -378,11 +378,11 @@ my @copy = @{$z};         # ERROR
 - ✅  **Named Capture Groups**: Defining named capture groups using `(?<name>...)` or `(?'name'...)` is supported.
 - ✅  **Backreferences to Named Groups**: Using `\k<name>` or `\g{name}` for backreferences to named groups is supported.
 - ✅  **Relative Backreferences**: Using `\g{-n}` for relative backreferences.
-- ✅  **Basic Unicode Properties**: Common `\p{...}` and `\P{...}` forms such as `\p{L}` execute through Joni.
-- 🟡  **Perl Unicode Property Syntax**: Perl-specific properties execute through Joni. `Age`, cumulative `In`/`Present_In`, General_Category, Canonical_Combining_Class, Bidi_Class, Decomposition_Type, East_Asian_Width, Numeric_Value, Joining_Group, Block, Script, and Script_Extensions assignments are generated from pinned Perl 5.44 Unicode 17.0 data with loose and wildcard aliases, ordered missing defaults, official compact aliases and shortcuts, Script-versus-Script_Extensions policy, reserved or composite values, exact rationals, and Perl's generated decimal keyword aliases; `ASCII_Hex_Digit`/`AHex` accepts Perl's eight boolean value aliases. Other generated property/value aliases still have pinned acceptance/rejection gaps.
+- ✅  **Basic Unicode Properties**: Common `\p{...}` and `\P{...}` forms such as `\p{L}` execute through Joni. General_Category assignments now enter the forked Joni parser unchanged and resolve to pinned Perl ranges there.
+- 🟡  **Perl Unicode Property Syntax**: Perl-specific properties execute through Joni. `Age`, cumulative `In`/`Present_In`, General_Category, Canonical_Combining_Class, Bidi_Class, Decomposition_Type, East_Asian_Width, Numeric_Value, Joining_Group, Block, Script, and Script_Extensions assignments are generated from pinned Perl 5.44 Unicode 17.0 data with loose and wildcard aliases, ordered missing defaults, official compact aliases and shortcuts, Script-versus-Script_Extensions policy, reserved or composite values, exact rationals, and Perl's generated decimal keyword aliases; `ASCII_Hex_Digit`/`AHex` accepts Perl's eight boolean value aliases. General_Category uses Joni's range-resolver API; the other families remain adapter-translated until their family-specific case-fold and wildcard semantics are represented natively. Other generated property/value aliases still have pinned acceptance/rejection gaps.
 - ✅  **Possessive Quantifiers**: Quantifiers like `*+`, `++`, `?+`, and `{n,m}+`, which disable backtracking, are supported.
 - ✅  **Atomic Grouping**: Use of `(?>...)` for atomic groups is supported.
-- ✅  **`\K` assertion**: Keep left — in `s///`, text before `\K` is preserved; match variables reflect only the portion after `\K`.
+- ✅  **`\K` assertion**: Keep left — in `s///`, text before `\K` is preserved; match variables reflect only the portion after `\K`. Ordinary KEEP assertions route through native Joni and no longer use the Java marker rewrite; the adapter still rejects KEEP inside lookaround until the Joni analyser emits Perl's diagnostic directly.
 - ✅  **Preprocessor**: `\Q`, `\L`, `\U`, `\l`, `\u`, `\E` are preprocessed in regex.
 - ✅  **Overloading**: `qr` overloading is implemented. See also [overload pragma](#pragmas).
 - ✅  **Python-style named groups**: `(?P<name>...)` and `(?P=name)` are parsed natively by Joni with Perl capture numbering, duplicate-name behavior, and malformed/unknown-name diagnostics.
@@ -394,7 +394,7 @@ my @copy = @{$z};         # ERROR
 - ✅  **Backtracking Control Verbs**: `(*ACCEPT)`, `(*FAIL)`/`(*F)`, `(*PRUNE)`, `(*SKIP)`, `(*THEN)`, and `(*COMMIT)` execute through Joni with matcher-owned cut boundaries. Atomic groups `(?>...)` are supported.
 - ✅  **Marks and named skip targets**: `(*MARK:NAME)` and its `(*:NAME)` shorthand, named `(*SKIP:NAME)`, `$REGMARK`, and `$REGERROR` execute through Joni and follow the selected backtracking path.
 - ✅  **Regex Definitions**: `(?(DEFINE)...)` containers and numbered or named calls to their subpatterns execute through Joni.
-- ✅  **Lookbehind Assertions**: Fixed and bounded variable-length positive and negative lookbehind assertions execute through Joni.
+- ✅  **Lookbehind Assertions**: Fixed and bounded variable-length positive and negative lookbehind assertions execute through Joni, including nested lookahead. Removing the remaining compatibility routing requires the complete lookbehind corpus and native diagnostics to pass.
 - ✅  **Branch Reset Groups**: `(?|...)` resets capture numbering across alternatives and preserves mapped match variables.
 - ✅  **Advanced Subroutine Calls**: Sub-pattern calls with numbered or named references like `(?1)` and `(?&name)` execute through Joni.
 - ✅  **Conditional Expressions**: Numbered and named capture conditions, positive and negative assertion conditions, recursion conditions `(?(R))`, `(?(R1))`, and `(?(R&name))`, executable callback conditions, and optimistic predicates execute through Joni.

src/main/java/org/perlonjava/runtime/regex/CaptureNameEncoder.java

@@ -269,9 +269,9 @@ public static boolean isDuplicateMarkerName(String javaName) {
      * from user-visible variables like %+ and %-.
      *
      * @param captureName The capture group name to check
-     * @return true if this is an internal capture (code block or \K marker)
+     * @return true if this is an internal code-block capture
      */
     public static boolean isInternalCapture(String captureName) {
-        return isCodeBlockCapture(captureName) || "perlK".equals(captureName);
+        return isCodeBlockCapture(captureName);
     }
 }