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/requirements.md

@@ -9,12 +9,12 @@ kube-ax cluster. BLOCK becomes "demonstrated", not "scored above a threshold". C
 
 ## Boundary Context
 
-- **In scope**: the board (facts, intents, hints) in the memory store; reason and explore steps as AX Tasks; the
+- In scope: the board (facts, intents, hints) in the memory store; reason and explore steps as AX Tasks; the
   demonstration contract and its verification; triage-to-search budgeting; a pilot on known fix pairs; a G1 arm on the
   unseen pool; model access through an operator-managed scoped key.
-- **Out of scope**: copying Cairn code (AGPL-3.0); network actions against anything but the code under analysis;
+- Out of scope: copying Cairn code (AGPL-3.0); network actions against anything but the code under analysis;
   changing the existing quick rules, engine or classifier (they are inputs here).
-- **Adjacent expectations**: `unseen-repo-evaluation` scores this arm; the AX batch dispatcher (`benchmarks/ax/batch.py`)
+- Adjacent expectations: `unseen-repo-evaluation` scores this arm; the AX batch dispatcher (`benchmarks/ax/batch.py`)
   and the kube-ax constraints (2 heavy lanes, `ousast-engine-` names, egress to public HTTPS) apply;
   `learned-decision-engine` Req 6.4 BLOCK rule is superseded for this arm by "demonstrated".