* feat(build): add locked reproducible wheel gate
Build independently in clean source trees and virtualenvs, compare wheel bytes, and stage only verified canonical distributions. Safely clean recognized prior outputs on repeat runs.
Part of #701
* ci(release): verify wheel reproducibility before publishing
Run the shared gate in PR and tag workflows, preserve failure diagnostics, and keep verification artifacts out of release checksums. Make Snap Store publication wait for the gate and reuse the canonical distributions for PyPI.
Part of #701
* docs(release): document reproducible wheel validation
Describe the locked toolchain, canonical publication boundary, same-platform scope, diagnostic outputs, and safe automatic cleanup.
* chore(scripts): update executable permissions
* fix(build): isolate release tooling and preserve cleanup retries
Exclude host site-packages from build-only virtualenvs so unlocked setuptools plugins cannot affect verified distributions. Delete staged artifacts before canonical ownership evidence to recover safely from interrupted cleanup.
Add regression tests and document the build-only environment exception.
* fix(release): make reproducible builds retryable and refresh tools
Regenerate release build exports from uv.lock. Hold a checkout lock through cleanup and staging, and atomically rename complete archives into dist. Cover interrupted staging, competing processes, and lock release with regression tests.
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Co-authored-by: Kanishk Pachauri <itskanishkp.py@gmail.com>
Co-authored-by: sesav <1636488+sesav@users.noreply.github.com>
