docs(arch): add projectable visual architecture page (casan-architecture.html)

Self-contained, full-screen-projectable HTML visualizing the base → competition
→ now journey: OLED-glass design, 3-milestone timeline, 7 harness bento cards
(color-coded H1–H7 with each file's role), 5 upgrade-track tables (Track A /
C-MVP / Evidence / H5+ / H6+) with gap-closed columns, honest-maturity panel +
one-line flow diagram. UTF-8 standalone doc (opens directly in a browser),
IntersectionObserver scroll reveals, custom cubic-bezier motion, mobile fallback.
Verified rendering in preview. Cross-linked from both architecture md files.
Adds .claude/launch.json (static server for local preview of optimize-docs).

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

.claude/launch.json

@@ -0,0 +1,11 @@
+{
+  "version": "0.0.1",
+  "configurations": [
+    {
+      "name": "casan-docs",
+      "runtimeExecutable": "python3",
+      "runtimeArgs": ["-m", "http.server", "8791", "--directory", "optimize-docs"],
+      "port": 8791
+    }
+  ]
+}