fix: add .pytest_cache to .gitignore (#11)

* fix(bin): correct misleading echo in install-rs

These are library-only crates using cargo build, not cargo install.
The "install complete" message was misleading — changed to "build complete".

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* refactor(test): move Python tests to top-level tests/ directory

Aligns with convention used by other dkdc-io repos (lm, bookmarks, sh)
and ensures bin/test-py discovers tests via default pytest collection.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: add .pytest_cache to .gitignore

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: lostmygithubaccount

.gitignore

@@ -7,4 +7,5 @@ __pycache__/
 *.egg-info/
 .venv/
 .ruff_cache/
+.pytest_cache/
 .DS_Store