Test total and partial Aeneas contract semantics

[joshlf]

Pin the execution guarantees independently of the specification macro.
Add kernel-checked examples for successful returns, named assumptions,
tuple results, generic modeling providers and dependent ghosts.

Total contracts reject panic and divergence even with postcondition True.
Partial contracts permit divergence but reject panic, wrong successful
results and decoder-rejected outputs. Keep Rust None and Err payloads
distinct from decoding rejection and execution failure.

Agent-authored-by: AI agent acting on joshlf's behalf

---

• 　  Prove record construction against independent Rust references #3846
• 　  Prove selected cast plans preserve size without metadata overflow #3845
• 　  Prove CastPlan selection and unchecked metadata arithmetic #3844
• 　  Prove cast validation and exact-size metadata inference #3843
• 　  Prove allocation-size preparation and tail containment #3842
• 　  Prove CastUnsized's production layout acceptance gate #3841
• 　  Prove the numerical bounds used by split operations #3840
• 　  Prove advancement and padding-sequence decisions #3839
• 　  Prove DstLayout padding and field extension #3838
• 　  Prove unit and usize PointerMetadata operations #3837
• 　  Prove trailing sizes, padding and capacity including overflow #3836
• 　  Prove primitive DstLayout constructors #3835
• 　  Add an independent Rust reference for nested DST sizes #3834
• 　  Specify rounding encodings as alignment and phase #3833
• 　  Relate recursive record layout to normalized size formulas #3832
• 　  Prove normalized trailing-size and capacity formulas #3831
• 　  Reuse Aeneas rules for views and indexed loops #3830
• 　  Prove least padding and greatest aligned predecessors #3829
• 👉 Test total and partial Aeneas contract semantics #3828
• 　  Verify Boolean and NonZeroUsize candidate predicates #3852
• 　  Verify the byte writers used by IntoBytes #3851
• 　  Prove U16 and U32 byte-order reads, writes and updates #3827
• 　  Prove guarded Boolean conversion and byte copying #3849
• 　  Reject unsupported execution effects before Aeneas lowering #3848
• 　  Check Rust specs against golden and live Aeneas models #3826
• 　  Separate cast plans from pointer reconstruction #3825
• 　  Move cast_from into layout/cast_from.rs #3824
• 　  Share Rust layout and byte models in anneal/lean #3823
• 　  Update Anneal to Aeneas ca282ec and Lean 4.31 #3822

Latest Update: v8 — Compare vs v7

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Version	v7	v6	v5	v4	v3	v2	v1	Base
v8	vs v7	vs v6	vs v5	vs v4	vs v3	vs v2	vs v1	vs Base
v7		vs v6	vs v5	vs v4	vs v3	vs v2	vs v1	vs Base
v6			vs v5	vs v4	vs v3	vs v2	vs v1	vs Base
v5				vs v4	vs v3	vs v2	vs v1	vs Base
v4					vs v3	vs v2	vs v1	vs Base
v3						vs v2	vs v1	vs Base
v2							vs v1	vs Base
v1								vs Base

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Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-08T10:22:09.227466Z	43af7f6	PR opened
🔒 Security Review	✅ Completed 2026-10-08T10:22:23.606601Z	43af7f6	PR opened

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.98%. Comparing base (05bc5fb) to head (1ab47dc).

Additional details and impacted files

@@                        Coverage Diff                         @@
##           G7q2xz2bs5ln4dfgckfspk2us4dhjperw    #3828   +/-   ##
==================================================================
  Coverage                              59.98%   59.98%           
==================================================================
  Files                                     23       23           
  Lines                                   3829     3829           
==================================================================
  Hits                                    2297     2297           
  Misses                                  1532     1532           

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