OpenROAD

Fix an OpenROAD bug from a GitHub issue. Analyzes the issue, traces the root cause through the codebase, implements the fix, creates regression tests (registered in both CMake and Bazel), runs clang-format, and prepares a signed-off commit. Use when given a bug report issue number, error code (e.g. GPL-0305, DRT-0001, RSZ-2007), or when asked to fix a bug in any OpenROAD module (ant, cts, dpl, drt, gpl, grt, mpl, odb, pad, pdn, psm, rcx, rsz, sta, stt, tap, upf, utl, etc.). Also triggers on: "fix issue", "debug this error", "resolve crash", "fix segfault", "repair", "patch bug".

Add integration or unit tests to an OpenROAD module. Handles the complete workflow: writing the Tcl/C++ test, generating golden files, and registering the test in BOTH CMake and Bazel build systems (the most common mistake is forgetting Bazel registration). Use when asked to add tests, improve test coverage, create regression tests, or write unit tests for any OpenROAD module (ant, cts, dpl, drt, gpl, grt, mpl, odb, pad, pdn, psm, rcx, rsz, sta, stt, tap, upf, utl, etc.). Also triggers on: "add test", "write test", "test coverage", "missing tests", "create regression test", "add unit test".

Review an OpenROAD pull request following the project's review priority order: correctness > QoR impact > testing > architecture > style > process. Fetches PR diff, analyzes changes, and prints draft review notes for the human reviewer to inspect and post manually. Use when asked to review a PR, check a pull request, look at changes, or provide code review for any OpenROAD module. Also triggers on: "review PR", "check this PR", "look at pull request", "code review", "review changes", "review #NUMBER".

Triage an OpenROAD GitHub issue by reproducing the bug and minimizing the test case with whittle.py. Use when an issue has an attached tarball artifact (.tar.gz) from `make *_issue`.