bug fixing

[nahime0]

• fix: allow parenthesized expression statements
• fix: allow standalone match expression statements
• fix: allow generator yields in try blocks
• fix: parse reference alias assignments
• fix: parse array element post-increment
• fix: parse numeric string int casts
• fix: preserve runtime class in get_class
• fix: preserve yield-from return through var_dump
• fix: deliver generator send payload
• fix: lower nested array append writeback
• fix: declare closure static local storage
• fix: keep by-ref closure captures dynamic
• fix: append hash arrays with php next key
• fix: keep escaped by-ref closure captures alive
• fix: throw ValueError for enum from misses
• fix: normalize float array keys
• fix: run finally for catch returns
• fix: snapshot arrow function captures
• test: add array access exception ordering stress
• test: add large arity by-ref array stress
• test: add spl delete iteration mutation stress
• fix: report duplicate named args after spread
• fix: warn on missing indexed array keys
• fix: include form feed in trim defaults
• feat: support array_filter mode constants
• feat: add json_decode error locations
• feat: add SortDirection enum
• feat: add grapheme_strrev builtin
• feat: add clamp builtin
• fix: add ReflectionClass getName
• fix: align function_exists namespace lookup
• test: add nullsafe side-effect stress coverage
• fix: forward yield-from send payloads
• test: cover yield-from captured return
• fix: map fiber start named spreads
• fix: resolve autoload class guards case-insensitively
• fix: stabilize x86 callable array dispatch