hooks.exclude_commands does not apply to head/tail rewrites #2363

Summary

Entries in [hooks] exclude_commands have no effect on the head -N file / tail -n N file rewrites. The same entries work for other commands.

Environment

rtk 0.42.3, macOS (Homebrew), Claude Code hook (rtk hook claude).

Reproduction

Config:

[hooks]
exclude_commands = ["head", "tail", "rg"]

$ rtk hook check "rg -n foo src"
No rewrite for: rg -n foo src          # exclusion works

$ rtk hook check "head -20 package.json"
rtk read package.json --max-lines 20   # exclusion ignored

Cause

In src/discover/registry.rs (develop), rewrite_segment_inner short-circuits head - / tail to rewrite_line_range() (around line 786) before the classify path reaches is_excluded() (around line 805). The short-circuit never consults the exclusion list.

Why it matters

rtk read --max-lines N returns a condensed view with elision markers rather than the verbatim first N lines:

$ head -3 package.json
{
}
[30 more lines]

That is the right trade for most output, but users who want verbatim head behavior reach for exclude_commands, the documented opt-out, and it silently does nothing for these commands.

Expected

exclude_commands applies to every rewrite path, including the head/tail short-circuit.