Record batch 7: every merge condition met, and a third coincidence found

All three surviving comparator components now die in both runtimes, the claim
finally has the home the map said it had, and the whole-message vector is
green at 376 bytes. The thin evidence is no longer thin: a populated tags
array and a populated payload both come out byte-identical, which was the
named risk and did not materialise.

Hands also found that Soul's counterexample, taken verbatim, does not kill the
mutation it was built for. It survives in both runtimes because select's push
order happens to match alphabetical sort for that naming, and the two runtimes
push in opposite orders. Not an unreachable branch: a coincidence, the third
of these in three days, and this one was caught while executing rather than by
a later pass.

My byte counts in the landing note were wrong, 86 and 99 against the real 228
and 246. The committed constants matched the real bytes all along; only the
prose beside them was wrong, which is the same shape as the two corrections
before it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/cultnet-selection-cut.md

@@ -3210,8 +3210,11 @@ still owes its Yggdrasil run**, and Soul's pass will provide it.
   Rust-side: `skip_serializing_if = "Option::is_none"` on four types omitted
   keys under `to_vec_named`. Removed from all four, `#[serde(default)]` kept
   for decode. **Byte-identical now, against real C# MessagePack 3.1.7 hex**:
-  `RawDocumentHeader` 86 bytes, `Edge` 99 bytes, each broken once by hand to
-  confirm the assertions are not vacuous.
+  `RawDocumentHeader` and `Edge`, each broken once by hand to confirm the
+  assertions are not vacuous. **The byte counts recorded here were wrong** —
+  86 and 99 — and are corrected to **228 and 246**, measured on Yggdrasil
+  against MessagePack C# 3.1.7. The committed hex constants matched the real
+  bytes exactly all along; only this prose was wrong.
 
   **"`Select` gains projection" was not built**, and Hands stopped and said
   why rather than reporting the ruling closed. Header and document projection
@@ -3400,3 +3403,51 @@ them.**
   path, not the claim itself.
 - **D10b's strictness gets a note** in the registration error and the map: a
   shape that used to register and work is now refused.
+
+### Fix batch 7 landed, 2026-09-23
+
+Sonnet, seven commits on `sel-fix7`, **all verified on Yggdrasil**, one slot
+at a time across thirteen sequential jobs with no concurrent verdicts. C#
+Networking **280 passed** (was 279 / 2 skipped), Mesh 255 unchanged, Rust
+**264 across 12 binaries** (was 259). Caching stays 190 / 3, the three still
+unprovable under a root container and deliberately not "fixed".
+
+**No production logic changed** except one error message and its comment.
+Everything else is tests and docs.
+
+- **R-AT.** All three surviving comparator components now die, in both
+  runtimes, at `-j1`: dropping both `to` components, reversing
+  `to.record_key`, and dropping `record_key` from Rust's row comparator.
+
+  **And Hands found that Soul's own construction did not actually kill the
+  "drop both" mutant.** Taken verbatim from the rig, it survives in *both*
+  runtimes — not because the branch is unreachable, but because `select`'s
+  push order happens to match alphabetical sort for that naming, and **the two
+  runtimes push in opposite orders** (Rust emits `cited` before `cites`, C# the
+  reverse). Rust needed the self-citer's key to sort *after* the target's,
+  C# needed the reverse. **A third fixture passing by coincidence**, found
+  while executing rather than by a later pass. Each runtime now carries its
+  own naming with the reasoning written into the test.
+- **R-AV.** `docs/runtime-parity-scope.md` gains the typed-selection row in
+  R-AY's words, naming the four files that carry the byte and semantic
+  vectors and calling out R-AR as separate and still open. **The claim now has
+  the home the map said it had.**
+- **R-AW.** Verified, not assumed: the committed hex constants are **228 and
+  246 bytes**, matching a real MessagePack C# 3.1.7 run. The map's prose is
+  corrected above; the constants were right all along.
+- **R-AX. The whole-message vector landed, byte-identical at 376 bytes**, and
+  the thin evidence is no longer thin:
+  - `RawDocumentHeader` with `tags = ["alpha","beta"]`: **239 bytes**,
+    identical — `string[]` and `Vec<String>` agree.
+  - `Edge` with `payload = [1,2,3]` and `payload_encoding = "messagepack"`:
+    **261 bytes**, identical — `byte[]` and `serde_bytes` agree.
+
+  **No divergence.** That was a real risk named in the ruling and it did not
+  materialise.
+- **D10b's breaking change is noted** in the error message and its owning
+  comment: a data member aliased `Owner` beside a reference member named
+  `Owner` used to register silently and fault at resolution; it is now refused
+  at the door with no compatibility path.
+
+**Every condition Soul set for merging is now met.** A final gate pass
+follows.