Keep local planning state out of repository history

PRD and plan files are local task bookkeeping, and OMX runtime data is local agent state. The repository should ignore those paths and stop tracking existing planning artifacts while leaving the files available on disk for local use.

Constraint: User explicitly directed PRD bookkeeping and .omx state not to be in Git
Rejected: Add only ignore rules | tracked PRD/plan files would remain part of repository contents
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Do not re-add PRDs, PLANS, or .omx state unless they are promoted to product documentation
Tested: git check-ignore -v PRDs/README.md PLANS/plan-005-photon-simulator.md .omx/state/foo conda-bld/osx-arm64/r-tttrlib-0.27.0-h60d57d3_0.conda
Not-tested: N/A

Author: tpeulen

.gitignore

@@ -15,25 +15,54 @@ tmp/
 playground
 junk/
 venv
-tttrlib
+# root-level build/install copy only — must not match nested package dirs
+# such as ext/**/io/github/fluorescencetools/tttrlib/ or ext/python/tttrlib.*
+/tttrlib
 !bin/tttrlib
 
+# Local planning and agent state
+PRDs/
+PLANS/
+.omx/
+
 # Windows artifacts
 nul
 
 # CMake builds
 cmake-build-*/
 cmake-build-release/
+build-*/
+CMakeCache.txt
+CMakeFiles/
+CMakeScripts/
+Testing/
+cmake_install.cmake
+compile_commands.json
+CTestTestfile.cmake
+DartConfiguration.tcl
+install_manifest.txt
+_deps/
+
+# Local ImageJ/Fiji plugin build & launch folder (native libs, ij.jar, jars)
+imagej-test/
+
+# Conda/rattler build output
+conda-bld/
+docsenv/
 
 # act cache
 .act-cache/
 
+# Local tooling state
+.claude/settings.local.json
+
 # Documentation and tools
 doc/_*
 doc/xml
 doc/_build/
 doc/paper*
 /doc/examples/
+doc/sg_execution_times.rst
 
 # IDE
 .vscode
@@ -44,7 +73,19 @@ doc/paper*
 # Python
 __pycache__
 *.egg-info/
+.eggs/
+.pytest_cache/
+.ruff_cache/
+.mypy_cache/
+.tox/
+.nox/
+.benchmarks/
 .ipynb_checkpoints
+.coverage
+.coverage.*
+coverage.xml
+htmlcov/
+pip-wheel-metadata/
 
 # Test data
 tttr-data