refactor(tests): extract CLI tests from main.rs into integration tests

.claude/instincts/co-change-awareness.md

@@ -17,7 +17,7 @@ When modifying these files, check if related files also need updates:
 | `src/lib.rs` | `src/main.rs`, `src/parser/ast.rs`, tests |
 | `src/evaluator/mod.rs` | `src/lib.rs`, `src/main.rs`, tests |
 | `src/parser/ast.rs` | `src/lib.rs`, `src/parser/grammar.rs`, `src/evaluator/types.rs` |
-| `src/main.rs` | `tests/cli_integration_tests.rs` |
+| `src/main.rs` | `tests/cli_integration.rs` |
 | `Cargo.toml` | `src/lib.rs`, `src/main.rs` |
 | `src/parser/grammar.rs` | `src/parser/mod.rs`, `tests/parser_integration_tests.rs` |
 

.claude/instincts/testing-conventions.md

@@ -14,7 +14,7 @@ Follow these testing patterns:
 
 1. **Unit tests**: Place in `#[cfg(test)] mod tests` within each source file
 2. **Integration tests**: Add to `tests/` directory with `_tests.rs` suffix
-3. **CLI tests**: Use `insta` snapshots in `tests/cli_integration_tests.rs`
+3. **CLI tests**: Use `assert_cmd` subprocess tests in `tests/cli_integration.rs`
 4. **Property tests**: Add to `tests/property_tests.rs` using `proptest`
 5. **Benchmarks**: Add to `benches/` using `criterion` with `harness = false`
 
@@ -35,6 +35,6 @@ Coverage target: >85% with `cargo llvm-cov`
 - 8 test files in `tests/` directory
 - 3 benchmark files in `benches/`
 - Every source file has inline `#[cfg(test)]` module
-- `insta` used for snapshot testing CLI output
+- `assert_cmd` used for subprocess-based CLI testing
 - `proptest` used for property-based testing
 - `criterion` used for benchmarks (not built-in bench)

.claude/skills/SKILL.md

@@ -78,7 +78,7 @@ Target File -> Memory Mapper -> File Buffer
 | `src/evaluator/mod.rs` + `src/lib.rs` | 8x | Evaluator changes exposed through lib API |
 | `Cargo.toml` + `src/lib.rs` | 6x | Dependency changes affect library code |
 | `src/lib.rs` + `src/parser/ast.rs` | 5x | AST changes re-exported through lib |
-| `src/main.rs` + `tests/cli_integration_tests.rs` | 4x | CLI changes require test updates |
+| `src/main.rs` + `tests/cli_integration.rs` | 4x | CLI changes require test updates |
 
 ## Clippy Configuration
 
@@ -128,7 +128,7 @@ impl ParseError {
 
 ### Test File Naming
 
-- CLI tests: `tests/cli_integration_tests.rs`
+- CLI tests: `tests/cli_integration.rs`
 - JSON output: `tests/json_integration_test.rs`
 - Parser: `tests/parser_integration_tests.rs`
 - Properties: `tests/property_tests.rs`