feat(cmake): add cmake build/configure filter

[cc1a2b]

Summary

• Fixes Add rtk cmake filter (collapse build progress, keep diagnostics) #2236: adds a compact rtk cmake filter (new native ecosystem for C/C++ tooling).
• cmake --build prints one [ NN%] Building ... line per translation unit plus make[N] "Entering/Leaving directory" chatter; a configure run emits a probe line per feature check. Once the build is green, none of that carries signal.
• The filter tallies objects/targets and drops the progress + probe spam, while keeping warnings, errors and the configure verdict verbatim. On failure it drops progress and preserves the diagnostics in full.

Behaviour

Input	Output
green cmake --build (progress spam + 1 warning)	cmake: built N targets, M objects + the warning
failed build	cmake: build failed (exit N) + the compiler diagnostics
cmake -S -B configure	keeps -- Configuring done / Build files written, drops -- Detecting/Check/Performing Test spam

On the fixture in the tests this is ~85% smaller (well past the 60% bar).

Wiring (per src/cmds/README.md#adding-a-new-command-filter)

• src/cmds/native/{mod.rs,cmake_cmd.rs,README.md} — new ecosystem + filter (pure &str -> String, run() via run_filtered_with_exit + with_tee("cmake") for raw recovery).
• src/cmds/mod.rs — register native.
• src/main.rs — Cmake subcommand + routing; added to is_operational_command so hook-rewritten cmake is integrity-checked (fails-open otherwise).
• src/discover/rules.rs — ^cmake\b → rtk cmake rewrite rule.
• src/cmds/system/pipe_cmd.rs — "cmake" in the filter resolver (so rtk pipe/smart can reach it).

Tests

cargo test --bin rtk cmake_cmd — 3 pass (progress collapse + ≥60% savings, failure keeps diagnostics, configure drops probe spam). cargo fmt --check and cargo clippy --all-targets clean; test_every_subcommand_is_classified updated (cmake added to PASSTHROUGH).

Closes #2236

[CLAassistant]

All committers have signed the CLA.

[cc1a2b]

Withdrawing this one to tidy up my open contributions — feel free to pick up the diff if the cmake filter is ever wanted.

[KnoerleMaTLS]

@aeppling Could we bring this feature in please? Would be nice for C/C++ developers i think.