release: v4.1.0 — assurance layer, TypeSafe, hardening + benchmark

Version bumped to 4.1.0 across the workspace, binaries, web console and Typst
template.

README: new "New in v4.1.0" summary; trimmed the verbose highlight bullets and
the TypeSafe section; removed the anti-plagiarism/provenance section (provenance
stays in the code, just not front-and-centre in the README); TypeSafe promoted
to its own top-level section; agent count 446.

TUTORIAL: new section 17 "Assurance & authorization" covering the target gate,
--scope-file, evidence-graded CVSS, audit anchoring + assurance bundle, sandbox,
intercept proxy, PoC re-validation, compliance mapping, TypeSafe, and the
internal/AD graph + budget governor.

benchmarks/typesafe-2026-09-20/: the with/without TypeSafe measurement —
report.html, scorer, both runs' findings/assurance/meta/logs, and a README.
No secrets committed (env-only during the runs, verified clean).

381 tests.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

neurosploit-rs/templates/report.typ

@@ -1,4 +1,4 @@
-// NeuroSploit v3.5.1 — Typst report template (blank, structured).
+// NeuroSploit v4.1.0 — Typst report template (blank, structured).
 //
 // The harness generates `report.typ` per run by prepending a `findings` array
 // and a `meta` dict, then including this template's rendering logic. This file
@@ -53,7 +53,7 @@
 
 #set page(margin: 2cm, numbering: "1", footer: context [
   #set text(size: 8pt, fill: gray)
-  NeuroSploit v4.0.0 · #meta.target · confidential
+  NeuroSploit v4.1.0 · #meta.target · confidential
   #h(1fr)
   // Build+run identity, so a page that circulates on its own still says which
   // engagement produced it.