[thekevinbot]

Refs #1330

Move one-shot query output and error handling behind injected state, execution, and writer effects. Unit tests exercise both successful rows and query failures, removing the corresponding mutation waiver. Added an end-to-end run_cli unit test that checks both successful and failed query exit codes, killing the wrapper mutants.

E2E Verification

• Python e2e receipt pending: main's Python e2e is red on glob_speed_depth_bound_test until Test one-level glob listings at speed of light #1317 merges; full-suite receipt will be written then. Latest full unfiltered run: 8 passed, then the known depth-bound glob failed (9.555s minus 0.041s startup vs 1.868s budget).
• TypeScript SDK e2e: full suite passed (18 tests); receipt written for latest source commit.
• Rust unit tests: cargo test -p dirsql --lib --features cli cli::run::tests (58 passed).
• Rust lint: cargo clippy -p dirsql --all-targets --features cli -- -D warnings.

Required preflight had one expected failure at Python e2e freshness because the full suite is red on the known main failure; all other gates passed.

Changelog / Migrations

• skip-changelog commit records behavior-preserving unit coverage; no public API or runtime behavior changed.
• Migration fragment not needed for test-only coverage.

[thekevinbot]

Superseded by main's run_query rewrite (injected writer and a streaming JSON path). The run.rs exemption is still on main; it will be redone in a fresh PR from main.