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/2000-01-05-talks.md

@@ -0,0 +1,20 @@
+---
+title: "Talks & Events"
+tags: software
+---
+
+# **Talks & Events**
+
+---
+
+## [MIT Bitcoin Hackathon 2025 1st Place Winner - Payjoin Integrations](https://x.com/satsie/status/1909081177765364080)
+
+- The Payjoin Team won the 2025 MIT Bitcoin Hackathon by building proof of concept integrations for [boltz.exchange](https://boltz.exchange/), [Liana](https://wizardsardine.com/liana/), and the first known [implementation](https://github.com/thebrandonlucas/interactive-payjoin) of Payjoin in the browser using WASM bindings from Payjoin Dev Kit [PDK](payjoindevkit.org) to Javascript, which doubled as an interactive tutorial for how Payjoin works.
+
+## [Supercharging Transactions with Async Payjoin - TABConf 6](https://www.youtube.com/watch?v=vPzvLxv0YfQ)
+
+- I gave a talk on the origins, history, and implications of the newly developed [BIP 77](https://github.com/bitcoin/bips/blob/master/bip-0077.mediawiki) a.k.a Async Payjoin, and how this dramatic improvement in Payjoin UX opens the door to mass wallet adoption and thus huge financial and privacy savings for all of Bitcoin at large.
+
+## [Micropayments and the Lightning Network - Voltage Workshop](https://www.youtube.com/watch?v=6Vq6foKst54&t=124s)
+
+- I did a workshop on the history of micropayments on the web, why they failed, and how the invention of the [Lightning Network](https://lightning.network) on Bitcoin is making that original dream for the web a reality.