fix: let the version resolve when only upstream tags are reachable

FORK.md

@@ -68,8 +68,14 @@ strings upstream can publish at will.
 
 The `quadbio-` tag prefix keeps our tags out of upstream's namespace. `tag_regex` in
 `pyproject.toml` strips it while keeping the local segment, which setuptools_scm's default would
-otherwise drop; `check_wheel.py` fails the build if `+quadbio.` ever goes missing. Off-tag builds
-keep the marker too — one commit past a tag gives `1.1.62.dev1+quadbio.N.g<sha>`.
+otherwise drop. The prefix is **optional** in that regex on purpose: upstream's own tags are
+reachable from `main` too, and a regex matching only ours makes setuptools_scm raise
+`Can't parse version from tag '1.1.61'` rather than fall back.
+
+`check_wheel.py` fails a *release* build whose version has no `+quadbio.` segment. Builds off an
+untagged `main` are `.devN` artifacts that are never published, so they are exempt. Once a
+`quadbio-*` tag is reachable they carry the marker anyway — one commit past a tag gives
+`1.1.62.dev1+quadbio.N.g<sha>`.
 
 **Never delete a release tag.** For `quadbio-1.1.61.post1` and `.post2` this is literal: they were
 cut from the old force-pushed `integration` and are reachable from no branch at all, so the tag is

pyproject.toml

@@ -70,8 +70,12 @@ source = 'vcs'
 # e.g. quadbio-1.1.61+quadbio.4. setuptools_scm's default tag_regex captures [^\+]*
 # and would silently drop the local part -- which is the half that makes the version
 # unforgeable, since PyPI must not accept local versions.
+#
+# The `quadbio-` prefix is optional on purpose: upstream's own tags (1.1.61, 1.1.59.post1,
+# ...) are reachable from main too, and a regex that only matched ours made setuptools_scm
+# raise `Can't parse version from tag '1.1.61'` instead of falling back.
 [tool.hatch.version.raw-options]
-tag_regex = '^quadbio-(?P<version>.+)$'
+tag_regex = '^(?:quadbio-)?(?P<version>.+)$'
 
 [tool.ruff]
 line-length = 88

scripts/check_wheel.py

@@ -31,8 +31,12 @@ def main(path: str) -> int:
         )
     # Wheel filenames are name-version-pytag-abitag-platform.whl, and PEP 440 local
     # separators are normalised to '.' in the filename, so '+quadbio.' survives intact.
+    #
+    # Only release builds are checked. A build off an untagged main is a `.devN` artifact
+    # that is never published, and before the first `quadbio-*` tag is reachable it has no
+    # local segment to carry.
     version = os.path.basename(path).split("-")[1]
-    if LOCAL not in version:
+    if ".dev" not in version and LOCAL not in version:
         sys.exit(
             f"{path} is versioned {version!r}, which has no {LOCAL!r} local segment.\n"
             "Either the tag was not `quadbio-<version>+quadbio.N`, or tag_regex in\n"