Heartbeat verification pass for this PR head (61e81ae):\n\n- uv run --with pytest pytest -q tools/intent/tests/test_show.py tools/intent/tests/test_graph.py → 19 passed\n- python3 -m py_compile tools/intent/sigil.py → passed\n- git diff --check github/main...HEAD → passed\n\nGitHub reports the PR as MERGEABLE/UNSTABLE, but there are no status checks attached in statusCheckRollup; this local verification covers the touched CLI show/graph path.

Heartbeat verification pass for this PR head (61e81ae):

• uv run --python 3.12 --with pyyaml python - <<'PY' ... py_compile + runpy ... PY -> passed on CPython 3.12.13; main is callable after import.
• uv run --with pytest pytest -q tools/intent/tests/test_show.py tools/intent/tests/test_graph.py -> 19 passed.
• python3 -m py_compile tools/intent/sigil.py -> passed on Python 3.11.2.
• git diff --check github/main..HEAD -> passed.

I also started the full pytest suite with uv run --with pytest pytest -q; it progressed past the first 103 tests but exceeded the 10-minute heartbeat budget, so I am not claiming a full-suite pass. GitHub still reports the PR as MERGEABLE/UNSTABLE with no status checks in statusCheckRollup; the Python 3.12 import/compile smoke directly covers the PR's f-string import fix.

Heartbeat re-verification at head 61e81ae:

• gh pr view still reports OPEN, MERGEABLE, mergeStateStatus=UNSTABLE, with no status checks surfaced.
• git fetch github main --prune succeeded.
• CPython 3.12.13 import gate passed via uv run --python 3.12: py_compile on tools/intent/sigil.py, runpy.run_path(...), and callable main assertion.
• Host Python 3.11 python3 -m py_compile tools/intent/sigil.py passed.
• uv run --with pytest pytest -q tools/intent/tests/test_show.py tools/intent/tests/test_graph.py passed: 19 tests.
• git diff --check github/main..HEAD passed.

I removed the incidental local uv.lock, .venv, and __pycache__ artifacts afterward; the verification clone is clean. The remaining blocker still looks like maintainer/check approval rather than a local code failure.

Heartbeat re-verification at head 61e81ae:\n\n- GitHub: PR remains OPEN / MERGEABLE / UNSTABLE, with no status checks surfaced.\n- Local CPython 3.12.13 lane passed via uv: python -m py_compile tools/intent/sigil.py.\n- Local CPython 3.12.13 import/runpy smoke passed: runpy.run_path('tools/intent/sigil.py') exposes callable main.\n- Targeted regression tests passed: uv run --with pytest python -m pytest tools/intent/tests/test_commands.py tools/intent/tests/test_graph.py -q => 41 passed.\n- Host Python 3.11 syntax check passed: python3 -m py_compile tools/intent/sigil.py.\n- Whitespace check passed: git diff --check github/main..HEAD.\n\nCleaned verifier-only .venv/uv.lock; clone is clean. No code changes made.