feat(node): handler for node --test (TAP summary) and node --check

[thibault-monteiro]

Closes #1950 (the node half).

What it does

Adds a rtk node subcommand that filters the output of two specific modes of the node binary:

• node --test [files...] — Forces --test-reporter=tap, parses the TAP 13 stream, emits a compact summary on success (node --test: 42 passed in 1234ms) and a summary + full failure blocks on failure (preserving the test name, error message and stack — the actionable signal). Skipped tests are reported.
• node --check FILE — Silent "ok" on success; passes through the SyntaxError stack verbatim on failure (already compact, and the agent needs the location to fix the issue).
• Other modes (node script.js, node -e '...') are intentionally NOT routed by the rewriter — their stdout/stderr is the user's program's output, which we don't want to filter.

Files

• src/cmds/js/node_cmd.rs — new handler with classify(), filter_node_test_output(), filter_node_check_output(). Wired into js/mod.rs automatically via automod.
• src/main.rs — Commands::Node { args } variant + dispatch + added to the deny-list match arm for command routing.
• src/discover/rules.rs — new RtkRule matching ^node\s+(--test(=|\s|$)|--check\s|-c\s). Category Tests, estimated savings 80% (test) / 60% (check).
• src/discover/registry.rs — three new tests: test_classify_node_test, test_classify_node_check, test_classify_node_run_is_not_routed.

Tests

src/cmds/js/node_cmd.rs ships 10 unit tests covering classify(), filter_node_check_output() (success/error), and
filter_node_test_output() (all-passing, with-failure, with-skipped, zero-tests, no-summary-passthrough).

I couldn't run cargo test locally on my Windows-GNU toolchain (the ring build requires gcc which I haven't installed). cargo fmt -- --check passes on all modified files. Counting on the Linux CI to validate.

Summary

Test plan

• cargo fmt --all && cargo clippy --all-targets && cargo test
• Manual testing: rtk <command> output inspected

Important: All PRs must target the develop branch (not master).
See CONTRIBUTING.md for details.

[CLAassistant]

All committers have signed the CLA.

[thibault-monteiro]

recheck