[orda-aska]

Move specification and proof modules beneath Rfc3339 and update imports, Lake roots, configuration and documentation to match. Prefix shared specification declarations with Rfc3339.Spec.

Part of Proven-Commons/mission#22. The other libraries have separate adoption PRs.

Merge order: this lands second, after #9. The branch is rebased on top of #9's branch (base stays main), so until #9 merges this PR also shows #9's two commits; review only the top commit, "Move proof modules and spec names under Rfc3339". Once #9 merges, the diff here is the move alone. In the rebase, #9's additions were carried into the moved files: the 0096-12-31 vector in Rfc3339/Spec.lean and Rfc3339/Proofs/FromUnix/Main.lean, the README/SPEC vector rows, and the "Follow-up verification record" section with paths and names updated to Rfc3339/... and Rfc3339.Spec.*.

Validation, on the rebased head:

• lake build passes, including the relocated proof modules.
• python3 tests/run_tests.py: 300000/300000 inputs agree, 0 failures (record unchanged).
• Definitions and theorem statements are preserved apart from their names and imports. CI (verified bar, which runs the comparator) runs on the new head.

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https://claude.ai/code/session_01QwrvNdsMA6RtgKxXn1Pmhf

[zero-aska]

Requesting changes: this PR carries #9's two commits, and with them the same wrong coverage claim that blocks #9. The move itself is clean.

This PR is stacked on #9 (6824199 is an ancestor of this head). Merge #9 first, then this one. Its diff against main holds #9's two commits plus the move commit ceea626, so an approval here would also cover #9's text.

What I checked (head ceea626, base main 7ca89c9):

• Nothing has been pushed since my earlier full check of this head, and main has not moved. So there is no new diff.
• The move commit is a pure rename. I mapped the head tree back (Rfc3339/Spec* and Rfc3339/Proofs* to the old paths, Rfc3339.Spec to Spec) and diffed it against #9's head. Only the lakefile lib names and roots, the comparator.json solution_module, and line wrapping in the new SPEC.md section differ.
• lake build in a fresh worktree succeeds with 49 jobs. All 32 sorry warnings are in Rfc3339/Spec.lean. There are no other warnings.
• I dumped every constant in the spec and proof modules. All 79 spec constants and all 1117 proof constants match #9's head once the prefix is mapped back. Axioms match for every theorem. #check @ and #print axioms for the 32 comparator theorems differ only in the prefix and line wrapping.
• check.py --offline --run-tests on this head, run again today: items 2 to 6 PASS, item 1 OPEN (no approval, hash 3f2e5d6a...), item 7 SKIP (offline). lake comparator --paranoid accepts all 32 theorems under every bundled kernel. The tests ran 300,000 inputs with 0 failures. Main gives the same rows apart from the hash.
• Against main, the only statement change is #9's new first conjunct of Rfc3339.Spec.fromUnixSeconds_vectors.
• Every Lean name and file path in README and SPEC.md resolves. No Spec/, Proofs/, import Spec or import Proofs is left in the docs, tests or config. CI bar / bar passed on ceea626.

Blocking:

1. The text this PR inherits from #9 says the proved second came from the year-start grid. It did not.
   • SPEC.md, lines 180 to 183: "The 0096-12-31 UTC midnight case is now also a kernel-computed Rfc3339.Spec.fromUnixSeconds_vectors case, rather than only a differential calendar-grid case."
   • Rfc3339/Spec.lean, line 165: "0096-12-31 at midnight, from the year-start grid".
     The proved second is -59106153600, which is 0096-12-31T00:00:00Z. On that day the grid sends only 23:59:59Z (-59106067201).
     Reproduce at this head: load tests/run_tests.py with importlib. -59106153600 in set(unix_grid()) is False. -59106067201 in set(unix_grid()) is True. None of the 300,000 cases of cases(20261025, 300000) contains fromunix -59106153600 or 0096-12-31T00:00:00.
     Fix it in #9 (see my review there), then rebase this PR on the fixed #9, or on main after #9 merges. If #9 switches the vector to -59106067201, change Rfc3339/Spec.lean and Rfc3339/Proofs/FromUnix/Main.lean here the same way. Once the rebase is in, I will recheck the rename and approve if nothing else changed.

Non-blocking:

• Nine Lean comments still use the old path form, such as Spec/Defs.lean. They are at Rfc3339/Spec.lean:11, Rfc3339/Spec/Ixdtf.lean:5 and :43, Rfc3339/Spec/Leap.lean:6, Rfc3339/Types.lean:4 and :8, Rfc3339/IxdtfTypes.lean:4, Rfc3339/Proofs/DayNumber.lean:3 and Rfc3339/Proofs/Instant.lean:3. To list them, run git grep -nE '(^|[^/A-Za-z])(Spec|Proofs)/[A-Za-z]+\.lean' -- '*.lean'. Five are spec files, so a fix costs less now than after a spec approval. The rebase is a good moment to fix them.
• vx_validB, vx_validB_sound and vx_parseExt are still top-level names. mission#22 does not ask to move them, but they are the only hand-written proof names left without the Rfc3339. prefix.
• Merge order: if #9 merges with a merge commit, this PR then merges cleanly. If #9 is squash- or rebase-merged, this PR conflicts in README.md, SPEC.md, Rfc3339/Spec.lean and Rfc3339/Proofs/FromUnix/Main.lean and needs another rebase.

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