Prove byte advancement and padding sequence queries

[joshlf]

Prove advancement and padding-query contracts for accepted representations. A
positive size-sequence comparison establishes equal sizes for every natural
metadata value; no converse is claimed for a negative result.

Add total Rust assertion harnesses for exact advancement outcomes and fields,
size offsets, wrapping padding, dynamic-padding classification, and checked
size equality after positive sequence answers. Preserve the existing stronger
unbounded size-sequence theorem.

Validation: fresh pinned extraction and complete-model golden comparison;
independent golden/live Lean builds, required-contract checks, and the
transitive axiom audit.

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

---

• 　  Prove record construction against independent Rust references #3846
• 　  Prove cast metadata composition against reference sizes #3845
• 　  Prove numerical cast plan selection and metadata conversion #3844
• 　  Prove cast validation and exact metadata inference #3843
• 　  Prove allocation size preparation and tail containment #3842
• 　  Prove the concrete CastUnsized layout gate #3841
• 　  Prove split lengths and non-overlapping numerical regions #3840
• 👉 Prove byte advancement and padding sequence queries #3839
• 　  Prove normalized layout padding and field extension #3838
• 　  Prove concrete pointer metadata operations #3837
• 　  Prove exact trailing sizes, padding and capacity #3836
• 　  Prove primitive layout constructors with recursive mathematical models #3835
• 　  Compare nested DST sizes with a recursive Rust oracle #3834
• 　  Model alignment and phase encoding as a bounded mathematical pair #3833
• 　  Refine recursive record semantics into normalized layouts #3832
• 　  Prove trailing-layout normalization and capacity arithmetic #3831
• 　  Reuse Aeneas specifications for views and indexed loops #3830
• 　  Strengthen arithmetic specifications and prove arithmetic corollaries #3829
• 　  Check native total and partial Aeneas specifications #3828
• 　  Prove scalar bit-validity predicates and checked byte candidates #3852
• 　  Prove production byte writes and preserved destination regions #3851
• 　  Prove unsigned byte-order reads, writes and updates #3827
• 　  Prove checked Boolean decoding and byte-prefix copying #3849
• 　  Inspect Rust execution before Aeneas lowering #3848
• 　  Verify doc-owned specifications over recursive mathematical models #3826
• 　  Separate numerical cast planning from typed pointer projection #3825
• 　  Move pointer cast implementation into its own source file #3824
• 　  Share Rust mathematical models across Anneal frontends #3823
• 　  Align Anneal V1 with the current Aeneas and Lean toolchain #3822

Latest Update: v7 — Compare vs v6

📚 Full Patch History

Links show the diff between the row version and the column version.

Version	v6	v5	v4	v3	v2	v1	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

⬇️ Download this PR

Branch

git fetch origin refs/heads/Gpvecn2gjh2spv5hy32nqxdlgiqp5jus7 && git checkout -b pr-Gpvecn2gjh2spv5hy32nqxdlgiqp5jus7 FETCH_HEAD

Checkout

git fetch origin refs/heads/Gpvecn2gjh2spv5hy32nqxdlgiqp5jus7 && git checkout FETCH_HEAD

Cherry Pick

git fetch origin refs/heads/Gpvecn2gjh2spv5hy32nqxdlgiqp5jus7 && git cherry-pick FETCH_HEAD

Pull

git pull origin refs/heads/Gpvecn2gjh2spv5hy32nqxdlgiqp5jus7

Stacked PRs enabled by GHerrit.

[chatgpt-codex-connector]

Codex Review Summary

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

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-08T10:25:44.428061Z	92358cf	PR opened
🔒 Security Review	✅ Completed 2026-10-08T10:25:03.595409Z	92358cf	PR opened

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review" or "@codex security review".

Codex reacts with 👀 while any review is running, comments if it has suggestions, and reacts with 👍 once all reviews finish with no findings.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 97 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.51%. Comparing base (a0346a0) to head (79ea0f5).

Files with missing lines	Patch %	Lines
zerocopy/src/layout/tail_transform_checks.rs	0.00%	97 Missing ⚠️

Additional details and impacted files

@@                          Coverage Diff                          @@
##           Ggsdoapsrkoab2sezv6aidvmzy46fo7pu    #3839      +/-   ##
=====================================================================
- Coverage                              55.69%   54.51%   -1.19%     
=====================================================================
  Files                                     28       29       +1     
  Lines                                   4124     4221      +97     
=====================================================================
+ Hits                                    2297     2301       +4     
- Misses                                  1827     1920      +93     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.