v0.3.0

Added

• Builtin method system for every core type (spec §18.1/§11.3/§11.6/§9, Phase 10). The embedded core::<class> .pra modules (String/Array/Dict/Set/Number/Char/Tuple/Option/Result) are now the single source of truth for each type's method set and /// docs, and builtin-value method calls dispatch through their class definitions with the @builtin(ON) layering (spec §18.4): the registered Rust fast path runs at opt_level >= N and the .pra fallback body is the semantic authority. String gains the full Python-str-inspired set (~50 methods: predicates, case transforms, padding, count/rfind/removeprefix/removesuffix/splitlines/expandtabs/partition/…; split("") yields the single characters); Array/Dict/Set fill the Python gaps (copy, setdefault, popitem, symmetric_difference, issubset/issuperset/isdisjoint, pop/clear/update); Number adds predicates/accessors (is_integer/abs/sign/floor/ceil/round/sqrt/numerator/denominator/real/imag/bit_length/is_*); Char/Tuple/Option/Result get their full small method sets (is_*/code/count/get/is_some/is_ok/value_or/…). prima doc --stdlib and failed-call diagnostics now cover every core type. Builtin-class method definitions live in the standard library; without prima_stdlib::init() the methods are unavailable (the interpreter reports a clear error).

Fixed

• Windows io tests. crates/prima-stdlib/tests/io.rs embedded the temp-file path directly into a Prima string literal; on Windows the path's backslashes (e.g. \U in C:\Users\...) were read as invalid escape sequences and every test failed with syntax error: invalid escape sequence. Paths are now escaped with primed_str (doubling backslashes, quoting double-quotes, spec §18.1) before interpolation.