Add santa-site tool documentation to README

- Update tooling section to include santa-site with command examples
- Add santa-site to repository layout tools list
- Change tool count from three to four tools in overview

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: eddmann

README.md

@@ -31,7 +31,7 @@ This project provides a means to scaffold, build, and verify `elf-lang` implemen
 - `specs/TASKS.md`: agent workflow, CLI contract, stage scopes, and completion criteria
 - `tests/`: stage directories containing `.santat` PHPT-style conformance tests and a short stage `README.md` describing scope and rules
 - `examples/`: example `.santa` programs
-- `tools/`: Rust binaries `santa-test`, `santa-bootstrap`, and `santa-journal`
+- `tools/`: Rust binaries `santa-test`, `santa-bootstrap`, `santa-journal`, and `santa-site`
 - `impl/`: per-implementation directories generated by `santa-bootstrap`
 
 ### Development stages (high level)
@@ -84,7 +84,7 @@ Advancement rule: only proceed when all tests in the current stage and all prior
 
 ### Tooling
 
-The workshop includes three helper tools: `santa-bootstrap` (scaffold a new implementation), `santa-test` (run PHPT‑style tests), and `santa-journal` (track progress and decisions). The generated implementation directory contains your code, an executable `cli`, any language‑specific files, and a `JOURNAL` for continuity.
+The workshop includes four helper tools: `santa-bootstrap` (scaffold a new implementation), `santa-test` (run PHPT‑style tests), `santa-journal` (track progress and decisions), and `santa-site` (generate a static website showcasing implementations). The generated implementation directory contains your code, an executable `cli`, any language‑specific files, and a `JOURNAL` for continuity.
 
 - santa-bootstrap
 
@@ -107,6 +107,14 @@ tools/bin/santa-journal [--dir <impl-dir>] <author|progress|entry|entries> [...]
 tools/bin/santa-journal progress stage-2 set in-progress
 ```
 
+- santa-site
+
+```bash
+tools/bin/santa-site [--out-dir <path>] [--impl-dir <path>] [--base-path <url-path>]
+# example
+tools/bin/santa-site --out-dir docs --base-path /santa-lang-workshop
+```
+
 ### Running examples (after completion)
 
 Implementations that pass all stages should be able to run the examples from repo root using the Makefile: