feat: add blu-site static site generator and fix language issues

Build a complete static site generator in Lux that faithfully clones
blu.cx (elmstatic). Generates 14 post pages, section indexes, tag pages,
and a home page with snippets grid from markdown content.

Language fixes discovered during development:
- Add \{ and \} escape sequences in string literals (lexer)
- Register String.indexOf and String.lastIndexOf in type checker
- Fix formatter to preserve brace escapes in string literals
- Improve LSP hover to show documentation for let bindings and functions

ISSUES.md documents 15 Lux language limitations found during the project.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

projects/blu-site/content/snippets/2000-01-08-work-description.md

@@ -0,0 +1,22 @@
+---
+title: "Work"
+tags: software
+---
+
+# **Work**
+
+---
+
+I started out by working at Chick-fil-A in the kitchen, then as a programmer for corporate.
+
+Most of my work since then has been in Bitcoin: one of the most fascinating
+technological developments of our time and the most promising of the emergent currencies.
+
+I work at Voltage in pursuit of that curiosity, working on streamlining
+payments via the Lightning Network.
+
+I also work on numerous Bitcoin side projects, primarily Payjoin: a novel method
+that makes transactions more scalable, cheap, private, efficient, and fun.
+
+It is believed that if we can get even a small percentage of the total number of Bitcoin transactions
+to use Payjoin, we can break the most common metric used to spy on people today: The Common-input Ownership Heuristic.