[anneal] Audit cached Lean artifacts against clean builds

[mdittmer]

Split the Nix pipeline at a shared, path-rewritten source tree. Keep the default fast path cache-seeded with one trace traversal, and add a seed-free Lean build whose packaged output passes through the same pruning and archive finalizers.

Compare complete source, toolchain, and Lake build payloads, including raw ILean reference usages, hash sidecars, and stable trace dependency/output hashes. Regenerate the two stale candidate ILean files exposed by that audit, install both archives independently, and compare the complete normalized InfoView setup contract in isolated environments.

Run the clean reference build and equivalence checks in a standalone nightly workflow on main so ordinary push and pull-request jobs retain the fast path.

---

• 👉 [anneal] Audit cached Lean artifacts against clean builds #3486
• 　  [anneal] Prime Lake traces in one server traversal #3485
• 　  [anneal][v2] Implement out-of-tree dependency chasing for generate command #3405
• 　  [anneal][v2] Add charon execution engine, generate command CLI, and integration tests #3404
• 　  [anneal][v2] Add pinned charon_lib dependency #3418
• 　  [anneal][v2] Add scanner module to map workspace packages to AnnealArtifacts #3402
• 　  [anneal][v2] Add Cargo workspace resolution and target resolution logic #3401
• 　  [anneal][v2] Add exocrate toolchain setup and Toolchain resolver #3400
• 　  [anneal][v2] Include Cargo in exocrate Rust toolchain #3463
• 　  [anneal][v2] Compile merged util module at stack base #3474

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Checkout

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Pull

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.85%. Comparing base (0c8cf6a) to head (c88afa3).

Additional details and impacted files

@@                        Coverage Diff                         @@
##           Gcz4iteion3frenivdjpngxluv7c3bshf    #3486   +/-   ##
==================================================================
  Coverage                              91.85%   91.85%           
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  Files                                     20       20           
  Lines                                   6093     6093           
==================================================================
  Hits                                    5597     5597           
  Misses                                   496      496           

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