Record Cut 6c's landing and the third harness batch

The Ghostlight shapes are in: two unit enums, a promise type, five fields,
four parsed referents where strings were, and one estimate type where two
were. Six schemas regenerated with the supersession bound carried into the
published JSON. The harness now restores on every path and repairs itself
after a killed run. Four scars recorded, the first being that a widened
type only reads as a kill when the fixture is spelled so the wider tree
still compiles.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

notes/eureka-pipeline-state-cut.md

@@ -51,7 +51,8 @@ schema-ownership phase inside Epiphany, not because the campaign stops.
   grammar was redesigned rather than patched a fourth time. Soul's first pass
   on the grammar found no collision in 212,450 adversarial keys and four
   unpinned checks.
-- **Cut 6c specified** against `95ee551a`; waits on the 6b fix batch.
+- **Cut 6c landed** at `4d6af409`, `13570e84`, `dddf9ede`, after the third
+  6b fix batch at `9d57a460`, `7cd1a38b`. Soul in flight on both.
 - **Cut 7 landed and closed** on Huginn `eureka/memory-organ` at `1320fc4`,
   `f63c0f2`, `e20c786`, fix `4094e68`; Eve `main` `e777e4c`, fix `167a2d3`;
   EveConformance `main` `048ea2f`. Started in parallel on the operator's
@@ -608,10 +609,21 @@ is the harness under failure, not the grammar:
   writer refuses first. A comment at `:651` still says "the 64-byte bound".
 - Hands' line counts were +6/−1 and +73/−6, not +5/−1 and +68/−6.
 
-**The third fix batch is in Hands** (writes inside the `finally`, a
-sidecar holding the original bytes so a killed run is repaired at the next
-start, a harness-owned command timeout, the trailing-dot fixture with X1 and
-X11 as entries, the stale comment), followed in the same tree by Cut 6c.
+**The third fix batch landed** at `9d57a460` (harness: every target write
+inside the restoring `try`; M0's write-through in its own `try`/`finally`; a
+shared restore that is hash-first, attempts every target, and prints
+`RESTORE FAILED` with the original SHA-256 before rethrowing; a sidecar
+`<target>.eureka-mutation-original` written before any write and removed
+after a verified restore, from which a run that died mid-mutation is
+repaired at the next start with a message; `-TimeoutSeconds`, default 1800,
+killing the process tree inside the command runner's own `finally` with the
+verdict `TIMED OUT (no verdict)`) and `7cd1a38b` (the reader refuses
+`c.:target:x`, `c:target:x.`, `c:target:.x` and `c:target:a..b`; X1 and X11
+are entries). Hands reproduced every attack: locked targets on either side
+leave both unchanged; a tree killed mid-entry leaves the mutant and the
+sidecar, and the rerun repairs and says so; a one-second timeout kills the
+runner and leaves the target unchanged. Soul in flight on this batch
+together with Cut 6c.
 
 ## Probes and source reads this pass
 
@@ -1766,6 +1778,38 @@ pinned a rev.
 `epiphany-pipeline/src/lib.rs` and the four schema files, this cut is wrong**:
 stop and report rather than retyping.
 
+**Landed 2026-09-16** at `4d6af409` (deletes; does not build by design, the
+outcome having no `Bounded` impl until the next commit), `13570e84` (the
+shapes; 26 tests, 0 warnings) and `dddf9ede` (entries M16-M22 in
+`tools/eureka-cut6c-mutations.psd1`). Hands re-anchored by content, since
+`lib.rs` had moved twice since `95ee551a`; the spec's "twenty tests" was
+twenty-one by then. `schemars` 1.2.2 accepted the `extend` attribute on the
+variant field, and `"maxItems": 8` appears exactly once, under
+`Superseded.by`. Six schema files regenerated (+193/−22); `index.json`
+byte-identical. All four suites green-and-killed afterwards, the nineteen
+6b entries included: keys did not move. Structural delta: source outside
+tests +45/−19, tests +163/−5, file 1,616 → 1,801 lines, no kind, dependency,
+target, format or epoch change.
+
+Corrections and scars from Hands:
+
+29. **M19 and M20 first came back "DID NOT BUILD."** The sample and the test
+    spelled the label and commit with the newtype constructors, so widening
+    the type made the tree fail to compile instead of admitting the forgery.
+    Fixed by constructing through `From<&str>`. A type-level mutation only
+    reads as a kill when the fixture is spelled so the widened tree compiles;
+    the spec implied that and did not say it.
+30. **`5f98228` is a legal seven-character sha**, so it was no forgery;
+    replaced by six characters.
+31. **The estimate test carries one assertion beyond the spec**: the sample
+    estimate equals the sample report's structural delta, which required
+    aligning the sample's `formats_added`. Soul is asked whether that moved
+    anything else.
+32. **The refusal `value` is the failing part, not the whole id**, so the
+    third-batch reader fixture asserts `field` only, as Cut 6b's did.
+
+Soul in flight.
+
 ## Cut 7. Retire Huginn's TypeScript body
 
 - **Repo/branch:** Huginn `main` at `91b7fcf`, on a new branch