remove uv references, move build script to scripts/

- Remove uv from documentation (now using Nix-provided Python packages)
- Move sources/scripts/build_fonts.py to scripts/iosevka_build.py
- Regenerate specimen images

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: jul-sh

.claude/nix-shell-usage.md

@@ -7,12 +7,11 @@ This project uses a Nix development environment that provides all necessary buil
 ## Why Use the Nix Shell?
 
 The Nix environment (`flake.nix`) provides:
-- Node.js (v22.21.1)
-- Python (3.13.9)
+- Node.js
+- Python with all font processing packages (fonttools, fontmake, fontbakery, gftools, etc.)
 - Rust/Cargo (for fontspector)
 - ttfautohint
-- fontspector (1.5.1)
-- uv (Python package manager)
+- fontspector
 - All other build dependencies
 
 ## How It Works

Makefile

@@ -4,7 +4,7 @@ PLAN := sources/private-build-plans.toml
 TEST_TARGETS := build fonts postprocess images test proof diff-postprocess
 
 # Source dependencies for each stage
-BUILD_SOURCES := $(PLAN) $(shell find sources/iosevka -type f 2>/dev/null) $(shell find sources/scripts -name "build_fonts.py" 2>/dev/null)
+BUILD_SOURCES := $(PLAN) $(shell find sources/iosevka -type f 2>/dev/null) scripts/iosevka_build.py
 POSTPROCESS_SOURCES := $(shell find scripts -name "post_process*.py" -o -name "fix_fonts.py" 2>/dev/null)
 
 # DrawBot image generation
@@ -40,7 +40,7 @@ fonts.stamp: $(BUILD_SOURCES)
 	@echo "Using build plan: $(PLAN)"
 	rm -rf general_use_fonts
 	rm -rf sources/iosevka/dist
-	python3 sources/scripts/build_fonts.py "$(PLAN)"
+	python3 scripts/iosevka_build.py "$(PLAN)"
 	@touch fonts.stamp
 	@echo "==> Raw fonts built successfully in general_use_fonts/"
 

README.md

@@ -16,11 +16,9 @@ The Make targets rely on the Nix flake dev shell, which not only bootstraps the
 
 ## Tooling
 
-- Nix flake in `flake.nix` (root) provisions Node, uv, native build tools (like ttfautohint), and other supporting dependencies.
-- uv syncs Python dependencies and activates `.venv` automatically via the flake `shellHook`.
-- `sources/iosevka` is a git subtree containing the upstream Iosevka sources.
-- `sources/scripts/` contains build scripts for raw font generation.
-- `scripts/` contains post-processing scripts for Google Fonts compliance.
+- Nix flake in `flake.nix` (root) provisions Node, Python with all font processing packages, native build tools (like ttfautohint), and other supporting dependencies.
+- `sources/iosevka` is a git subtree containing the upstream Iosevka sources and Iosveka Charon build plan.
+- `scripts/` contains scripts for building, and post processing to achieve Google Fonts compliance.
 
 ## Repository layout
 

documentation/iosevka-charon-mono.png

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Run a command inside the Nix + uv development environment with a Docker fallback.
+# Run a command inside the Nix development environment with a Docker fallback.
 
 set -euo pipefail