fix(c): initialize typed repeat arrays inside their value wrapper - #6038

Typed [T; N] repeat locals and returned array values emitted C range designators at the structure level. Clang and GCC rejected the generated api_documenter and traffic_animator modules. Initialize the known by-value wrapper's v member while retaining plain arrays, existing lists, function signatures and value-return lifetimes.

The source fixture and six native integration tests compile and execute the generated C, check four indices over256 values plus boundary values, and reject source fill/extent mutants and an oversized initializer. The accepted baseline passes two controls and fails four actual compilation regressions; the corrected compiler passes all six on Clang21 and Linux GCC12.2.0. The existing Clang limitation for effectful GNU range fills remains outside this repair.

Validation: actual bootstrap2828 passed/0 failed/2 ignored across123 targets; native corpus ratchet retains95 expected failures/cap126; all75 tri-net C modules compile and execute on Clang and real Linux GCC with unchanged workflow flags. Exactly two of284 outputs change;102Rust/107Zig/113Verilog outputs remain byte-identical to the accepted baseline. Complete804 sealed-spec audit finds zero existing hash/alias changes; coverage1449/1325/124 and the debt ledger stay unchanged. FROZEN matches the actual compiler source.

tri-net product source, generated files, PIN and budgets remain unchanged. Its separate Zig and Verilog adoption blockers remain.

Closes #6013.