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-rw-r--r--docs/superpowers/specs/2026-08-19-ci-build-family-filter-design.md10
1 files changed, 8 insertions, 2 deletions
diff --git a/docs/superpowers/specs/2026-08-19-ci-build-family-filter-design.md b/docs/superpowers/specs/2026-08-19-ci-build-family-filter-design.md
index 524568aeb..799c83c23 100644
--- a/docs/superpowers/specs/2026-08-19-ci-build-family-filter-design.md
+++ b/docs/superpowers/specs/2026-08-19-ci-build-family-filter-design.md
@@ -49,8 +49,8 @@ never inflates one axis with another's breadth.
| # | Changed path | Build families | Build examples | HIL boards → tests |
| --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------- | ----------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------- |
| 1 | `docs/`, `.claude/`, `*.md`, `*.rst`, `LICENSE` | — | — | — |
-| 1b | `.gitignore`, `.clang-format`, `.idea/**`, `test/{fuzz,unit-test}/**`, non-build `.github/**`, packaging manifests | — | — | — |
-| 2 | `test/hil/**` | — | — | all boards → all tests |
+| 1b | `.gitignore`, `.clang-format`, `.idea/**`, `test/{fuzz,unit-test}/**`, `test/hil/test/**`, non-build `.github/**`, packaging manifests | — | — | — |
+| 2 | `test/hil/**` (not `test/hil/test/**`) | — | — | all boards → all tests |
| 2b | `tools/metrics.py`, `.github/scripts/metrics_*.py` | `ALL` (unchanged — `tinyusb_metrics` runs `metrics.py` as a build target) | `ALL` | — (nothing on the rig runs it) |
| 3 | `src/portable/<port>/dcd_*`, `*_device.[ch]` | `FAM` | `DEV`+`DUAL` | `FAM`'s device-role boards → device+dual tests |
| 4 | `src/portable/<port>/hcd_*`, `*_host.[ch]` | `FAM` | `HOST`+`DUAL` | `FAM`'s host-role boards → host+dual tests |
@@ -75,6 +75,12 @@ never inflates one axis with another's breadth.
**Rule 2 is deliberately asymmetric.** A `test/hil/**` change is invisible to the family matrix
but is exactly what the rig exercises, so it builds nothing and runs everything.
+`test/hil/test/**` is carved out to rule 1b: it holds the harness's own unit tests, which
+nothing on the rig runs (pre-commit does, and `build.yml` runs `test_ci_select.py` as the
+gate before trusting a selection). A bare `test/hil/` prefix was booking the full 27-board
+rig for diffs that cannot reach it. The carve-out is a claim about that directory's
+contents, so a test pins its file list: add anything the rig reads and it fails.
+
**Rule 7 is the one HIL-side behaviour change in this design.** Today `hw/mcu/` sits in
`hil_select`'s `_FULL_RE` and forces the full HIL matrix. Since the build axis now resolves
those paths to a family through the same scan, forcing full on the rig is inconsistent. The