20260805 classic codegen

[prozacchiwawa]

Note

High Risk
Large refactor of the classic compilation pipeline with new language features (&rest, @env, modern com assembly) that can change generated CLVM and error reporting across many code paths.

Overview
Introduces a ClassicAllocator abstraction (with ClError carrying Srcloc) and SExpClassicAllocator, which keeps modern compiler S-expressions and raw CLVM nodes in sync so stage-2 can report source locations instead of only NodePtr-based EvalErr.

Stage-2 com, mod, pattern matching, and shared sexp helpers are generalized over that trait; compile_application gains &rest tail handling, and defun-inline can reference @*env* via new inline-environment lowering.

For strict/modern dialects, com now runs assemble_com_program to turn symbolic operator heads (e.g. q) into numeric opcodes while preserving per-subexpression locations; @*env* is also recognized like @ during symbol transformation.

CI updates mandelbrot-cldb.py with optional sigil substitution and YAML-based output comparison (plus pyyaml in the workflow).

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