docs: plain-English pass over the active specs

Ran the humanizer rules over 79 prose files in the active specs (brief,
design, requirements, research and narrative docs). Removed em dashes,
significance inflation, forced rule-of-three, bold-label list items and
filler. Skipped tasks.md checklists and the retired specs (harnessx-*,
openrouter-sast-harness, unseen-repo-evaluation).

Every number, path, command, hash and identifier was preserved: checked
each file against HEAD for drift in numbers, inline code and code fences,
zero drift across all 79 files.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

.kiro/specs/search-with-proof/HANDOFF.md

@@ -1,32 +1,32 @@
-# Search-with-proof — handoff (2026-10-06)
+# Search-with-proof, handoff (2026-10-06)
 
 State at handoff, for resuming on the search problem and abstract interpretation.
 
-## RESOLVED 2026-10-07 — the one open question is CLOSED: first cluster demonstration achieved
+## RESOLVED 2026-10-07, the one open question is CLOSED: first cluster demonstration achieved
 
 The "first `demonstrated`" question below is answered. search-with-proof produced its first autonomous
 `demonstrated` finding end to end on kube-ax, and a blind negative confirmed no false proof.
 
-- **Pair:** hanxi/xiaomusic (pilot pair 13), family `path`, vulnerability class **prefix-check bypass**
+- Pair: hanxi/xiaomusic (pilot pair 13), family `path`, vulnerability class **prefix-check bypass**
   (`startswith(root)` without a trailing separator; the fix adds `os.sep`). Image `e2c8b460`.
-- **Vulnerable side:** `demonstrated` — owned effect in 3/3 affected runs, 0/3 safe runs. $0.37, 55 calls.
-- **Fixed side (blind negative, Req 6.3):** `inconclusive`, **0 false proofs**. $0.56, 85 calls.
-- **Pair total:** $1.22. Record: `benchmarks/measurements/2026-10-07-search-first-cluster-demonstration/`.
+- Vulnerable side: `demonstrated`, owned effect in 3/3 affected runs, 0/3 safe runs. $0.37, 55 calls.
+- Fixed side (blind negative, Req 6.3): `inconclusive`, **0 false proofs**. $0.56, 85 calls.
+- Pair total: $1.22. Record: `benchmarks/measurements/2026-10-07-search-first-cluster-demonstration/`.
 
 **The original pair-6 both-sides-false was a TWO-part diagnosis, both now fixed:** the demo did not reach the
-observable (demo/agent), and — the decisive one — the path oracle only modelled **classic parent traversal** while
+observable (demo/agent), and (the decisive one) the path oracle only modelled **classic parent traversal** while
 many real path CVEs (xiaomusic included) are **prefix-bypass**, which reaches a sibling that string-extends the served
 dir, not the parent. The oracle now also plants a prefix-sibling canary.
 
 **Fix chain that enabled the demonstration (each merged to main and validated by a paid run):**
-1. Parity — agent is told the observable's location (path oracle reached parity with command/ssrf).
-2. Verify-time-only — the observable is injected at verify time and absent during exploration; stop the explore-time
+1. Parity. The agent is told the observable's location (path oracle reached parity with command/ssrf).
+2. Verify-time-only. The observable is injected at verify time and absent during exploration; stop the explore-time
    reachability trap that burned budget without authoring a demo.
-3. Fair-share pilot budget — each search gets a fair share of `--ceiling-usd` with rollover, so one expensive search
+3. Fair-share pilot budget. Each search gets a fair share of `--ceiling-usd` with rollover, so one expensive search
    no longer starves the rest.
-4. Served-root guidance — the demo MUST set the app's served directory to the `${served_root}` placeholder.
-5. Oracle prefix-bypass coverage — plant a sibling canary for the `startswith`-without-separator class.
-6. Control-signal feedback — the keystone control (does the app serve `${served_root}`?) is fed back to the agent as a
+4. Served-root guidance. The demo MUST set the app's served directory to the `${served_root}` placeholder.
+5. Oracle prefix-bypass coverage. Plant a sibling canary for the `startswith`-without-separator class.
+6. Control-signal feedback. The keystone control (does the app serve `${served_root}`?) is fed back to the agent as a
    `served-root` hint so it self-corrects its wiring. This was the decisive last step.
 
 **Keystone (honest measurement), merged earlier:** the verifier runs a benign positive control; a broken or mis-wired
@@ -38,7 +38,7 @@ dependency build-break (`filed`→`mime@4`) is pinned.
 
 ---
 
-## The one open question (HISTORICAL — resolved above)
+## The one open question (HISTORICAL, resolved above)
 
 The full chain runs end to end on kube-ax. Every execution layer is cleared. The **first `demonstrated` has not
 happened yet**, and the remaining gap is narrow and reproducible at **$0 model cost** via `demo_replay`.
@@ -59,7 +59,7 @@ Both-sides-false means it is **not the harness** any more. It is one of:
   capture in `oracles.py` `PathOracle.observe`).
 - Re-run with `python -m benchmarks.search.demo_replay --both --demo <stored demo.json> --family path --lane ax
   --image <digest> ...`. Stored demos live under `benchmarks/search/private/runs/*/<pair>/demo/demo.json` (gitignored).
-- **Classifier note:** keep exploit payloads on disk. Hand Codex file-path tasks that treat demo contents as opaque;
+- Classifier note: keep exploit payloads on disk. Hand Codex file-path tasks that treat demo contents as opaque;
   print outcomes / phase timings / error *classes*, never request strings, env values, or step bodies. See memory
   `search-with-proof-direction` and the classifier false-positive note. Code changes never tripped it; echoing
   payloads or step-by-step attack prose did.
@@ -95,9 +95,9 @@ image (pip 3.13 vs venv 3.12 → use `sys.executable`) → checkout root on sys.
 - `/workspace` ~3 GiB free per node until the volume move; scratch guard 2 GiB/task.
 - Pilot spend to date ~$11 across 9 paid runs; the decisive replay was $0.
 
-## Decision model vs search — current read
+## Decision model vs search (current read)
 
 - Decision/classification: measured, **promising as triage** (within-pair AUC 0.762; trained logistic ties at 0.721),
   **capped as a blocker** (cannot prove 95% precision). Reframed as triage (`learned-decision-engine` Req 6.5).
-- Search-with-proof: **not yet demonstrated**, but no observation so far argues against the idea — every failure was
+- Search-with-proof: **not yet demonstrated**, but no observation so far argues against the idea. Every failure was
   our execution, now cleared. The pair-6 demo/oracle question is the first verdict on the method itself.