test: remove shallow parse-only smoke tests from compile.test.ts (#72)

[thiagoralves]

Summary

Closes #72. Removes 82 shallow parse-only smoke tests from tests/integration/compile.test.ts. Each only did:

const result = parse(source);
expect(result.ast).toBeDefined();
expect(result.errors).toHaveLength(0);

— no AST-structure or codegen assertions. The constructs they touch (arithmetic/comparison/logical operators, control flow, literals, variable/type declarations, multi-POU) are exercised far more rigorously by the codegen-*.test.ts and cpp-compile/st-validation suites, which parse and generate and assert real C++ output. A parse-only "no errors" check is strictly weaker and adds nothing those provide.

136 → 54 tests in the file; full suite green (1917 passed, down exactly 82), typecheck clean. Diff is deletion-only (no quote/format churn — tests/ isn't covered by prettier --check src/).

Why this supersedes #79

I classified every it() in the current file. PR #79 (March, line-range based) was both incomplete and slightly over-broad:

• Missed the two function-parsing sections — Parse Function Tests (5 shallow) and Function and Function Block Parsing Tests (4 shallow) — which sit before its "keep first 536 lines" cutoff but are shallow too.
• Over-removed: deleted the whole Complex Program Tests section, including a meaningful compile()+success test.
• Was a stale line-range diff against a file that has since grown to 2101 lines.

What was removed vs. kept

Removed in full: Function/FB Parsing, Expression Parsing, Chained Expression, Literal Types, Direct Address, Type Declaration, Additional Expression Edge Cases, Multiple POU, Variable Declaration, Control Flow Parsing, Edge Case.

Trimmed (kept the non-shallow cases):

• Parse Function Tests → kept should return errors for invalid syntax (negative test) and should parse empty input (edge/contract).
• Complex Program Tests → kept should parse configuration with VAR_GLOBAL and programs with VAR_EXTERNAL (compile() + success).

Untouched meaningful sections: Project Structure, Error Handling, Compiler Options, External Code Pragma, Future Integration.

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