#44 refactor(crates): demote 7 over-engineered Rust binaries to shell scripts

[radiosilence]

Summary

• 7 Rust binaries demoted to shell scripts in scripts/: unfuck-xcode, url2base64, install-font-macos, parallel-dl-extract, prune-gen, vimv, imp
• 3 Cargo deps dropped: reqwest, zip, base64 (only used by demoted tools)
• ~2,100 net LOC removed (331 added, 2,407 deleted)
• 10 Rust binaries remain — the ones that genuinely earn Rust (rayon parallelism, img-parts binary format parsing, git2, netstat2)
• Updated Cargo.toml, dotfiles.toml completions, Taskfile.yml completion generation, both READMEs, CHANGELOG

Why

These 7 tools were 90+ lines of clap boilerplate wrapping curl, aria2c, unzip, sudo rm, and $EDITOR. Rust added nothing — no parallelism, no binary parsing, no type safety benefits. Shell scripts do the same job in 5-30 lines each.

Fewer deps = faster compile times, smaller attack surface, less to audit.

Test plan

• cargo check passes (zero warnings)
• cargo clippy --all-targets -- -D warnings passes
• cargo test --all-targets passes (45 tests)
• cargo fmt --all applied
• All 7 shell scripts pass bash -n syntax check
• Verify demoted scripts work on a clean shell (unfuck-xcode --dry-run, prune-gen, url2base64 --help, etc.)

Closes #44

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