perf(uv): deduplicate wheel installs

[jbedard]

Close #1352

Changes are visible to end-users: yes

• Searched for relevant documentation and updated as needed: yes
• Breaking change (forces users to change their own code or config): no
• Suggested release notes appear below: yes

Performance: share wheel installs across lockfiles when equivelent

Test plan

• Covered by existing test cases
• New test cases added

[aspect-workflows]

✨ Aspect Workflows Tasks

📅 Fri Jul 24 18:36:20 UTC 2026

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[github-actions]

py_binary startup benchmark

Version	Mean (ms)	Median (ms)	± stddev	vs BCR	vs main	Build (s)
BCR 1.11.7 (baseline)	147.964	147.844	±1.251	—	—	83.71
HEAD main	54.012	53.695	±1.670	-63.5%	—	9.78
This PR	54.048	53.235	±3.574	-63.5%	+0.1%	6.90

Measured with hyperfine --warmup 5 --runs 50 on Linux
Gate: PR vs HEAD main (threshold: 10%). BCR is shown only as a historical baseline.
Build time: cold bazel build //:bench with isolated output base, no disk cache.

sys.path quality

Version	sys.path entries	distinct site-packages roots	duplicate realpaths
BCR 1.11.7 (baseline)	6	1	0
HEAD main	7	2	0
This PR	7	2	0

sys.path quality measured by bench_syspath inside the assembled venv. Duplicate realpaths indicate symlink redundancy; many distinct site-packages roots suggest an inefficient venv layout.

Bazel analysis benchmark

Version	Mean (ms)	Median (ms)	± stddev	vs BCR	vs main	Packages	Targets
BCR 2.0.0-alpha.4 (baseline)	6732.901	6723.355	±158.342	—	—	101	301
HEAD main	5938.286	5901.186	±107.094	-11.8%	—	101	301
This PR	5865.054	5898.159	±190.144	-12.9%	-1.2%	101	301

Measured with hyperfine --warmup 1 --runs 10 on Linux
Gate: PR vs HEAD main (threshold: 10%). BCR is shown only as a historical baseline.
Command: cold bazel build --nobuild //workspace/... with isolated output base, no disk cache.

Auxiliary metrics

Version	Loaded packages	Configured targets
BCR 2.0.0-alpha.4 (baseline)	101	301
HEAD main	101	301
This PR	101	301

[jbedard]

@tamird (the robot) looking-for-review

[tamird]

Reviewing at Jason’s explicit request.

The wheel-install identity preserves ordered content-addressed wheels and exclusion policies while refusing to share source builds, patches, extra dependencies, or extra data. Both project SCC references and source-build dependencies are rewritten before duplicate repositories are removed, so platform and runfiles resolution continue to target the canonical install.

The three-universe end-to-end fixture measures the actual reduction from 26 reachable install repositories to 12, verifies both matching and different exclusion policies, and runs imports from each project. All 86 exact-head checks pass.

— tamirdex