Adds control flow, field access, forward self calls, method/program entry tracking, and E227 emission-failure reporting. Print vectors now live in safe zero-page cells to avoid the 6502 indirect-JMP page bug.

Statement emission now runs from parser pass 2: assignment, byte + and -, and
print reach codegen.s through emit.s, and the statements fixture executes the
emitted bytes in x128. Restoring the parser trace fixture's length arithmetic
(it emitted between the two halves of the subtraction, which clears carry)
brings the 41-fixture parser verification back to green after emit.s joined
the link.

Also check in the vim clone's improved C128 build and the Power C
reverse-engineering notes and tools.

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Co-Authored-By: Codebuff <noreply@codebuff.com>

Generated methods can now store and load fields through a zero-page receiver,
pass self to direct JSR calls, and keep byte or word results across argument
cleanup. The backlog gains the parser-to-codegen and pass-3 address assignment
stories the next backend work needs.

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Generated programs now have control-flow emission, text and fault output, a
free-list heap, class descriptors, and object construction/deletion. Each
story lands with an x128 fixture and verifier so the runtime stays proven
before the parser drives code generation.

🤖 Generated with Codebuff
Co-Authored-By: Codebuff <noreply@codebuff.com>

Emit bounded documented instructions for scalar assignments, word and integer
arithmetic, comparisons, and short-circuit booleans, with checked forward
branch fixups. Add multiply and signed/unsigned divide helpers with a stable
divide-by-zero result, plus a reviewed golden byte stream and disassembly.

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Co-Authored-By: Codebuff <noreply@codebuff.com>