Move HTML content from Rust raw string literals into proper .html
files, replacing each _html.rs with a 1-line include_str!() call.
- runtime-dashboard: dashboard.html (511), actors.html (739),
distribution.html (746)
- simulation-dashboard: dashboard.html (1,436)
Enables proper HTML syntax highlighting and linting in editors.
Authored by Claude, lovingly guided by Zachery Aaron Shores-Chmielewski
