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/2000-01-01-writing-description.md

@@ -0,0 +1,44 @@
+---
+title: "Writing"
+tags: software
+---
+
+# [**Writing**](/writing)
+
+---
+
+## **Articles**
+
+- ### [Fear to Attempt](/posts/articles/2025-06-20-fear-to-attempt)
+
+- ### [Payjoin for a Better Bitcoin Future](/posts/articles/2023-10-31-payjoin-better-future)
+
+- ### [Micropayments and the Lightning Network](/posts/articles/2023-03-10-micropayments)
+
+---
+
+## **Blog**
+
+- ### [Nix for Fun and Profit: Programs as Lego's](/posts/blog/2025-11-21-nix-programs-as-legos)
+
+- ### [`<bitcoin-qr/>` - A Zero-Dependency Web Component for Stylish BIP-21 Payments](/posts/blog/2025-02-21-bitcoin-qr)
+
+- ### [Automating Site Deployment for an `nb` -> Github -> VPS Setup](/posts/blog/2025-02-13-automate-site-deploy)
+
+- ### [Hard Reset Asahi Linux After Boot Error and Data Backup](/posts/blog/2025-02-12-asahi-boot-fix)
+
+- ### [File Synchronization For All Your Devices with Syncthing](/posts/blog/2025-02-12-syncthing-nb)
+
+- ### [Toward a Better Site](/posts/blog/2025-01-29-blog-revamped)
+
+- ### [Reading, Writing, and Civilization](/posts/blog/2023-09-26-reading-writing-civilization)
+
+- ### [The First Monotheist](/posts/blog/2023-09-21-worlds-first-monotheist)
+
+---
+
+## **Journal**
+
+- ### [February 2025](/posts/journal/2025-02-01-feb25)
+
+- ### [January 2025](/posts/journal/2025-01-01-jan25)