Add cowsay command

[Copilot]

Implements cowsay as a new CLI binary — renders a speech bubble around a message and prints ASCII cow (or Tux penguin) art below it.

Changes

• src/bin/cowsay.zig: New binary with:
  • writeSpeechBubble: single-line uses < text >, multi-line uses /, |, \ side borders with padding to align all lines
  • Two built-in cow faces via -f/--face enum flag: cow (default) and tux
  • Positional args joined with spaces as the message
  • Unit tests for single-line, two-line, and three-line bubble rendering
• build.zig: Registers cowsay in the binary list (auto-wires run-cowsay, install-cowsay, test-cowsay)

Usage

$ cowsay hi
 ____
< hi >
 ----
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

$ cowsay -f tux hi
 ____
< hi >
 ----
   \
    \
        .--.
       |o_o |
       |:_/ |
      //   \ \
     (|     | )
    /'\_   _/`\
    \___)=(___/

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>implement new command: cowsay</issue_title>
<issue_description>```
$ cowsay hi

---

< hi >

    \   ^__^
     \  (oo)\_______
        (__)\       )\/\
            ||----w |
            ||     ||

$ cowsay -f tux hi

---

< hi >

.--.
|o_o |
|:_/ |
// \
(| | )
/'_ /`
_)=(/

- https://en.wikipedia.org/wiki/Cowsay</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes implement new command: cowsay #8

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[Copilot]

Pull request overview

Adds a new cowsay CLI binary to the ZigCLI suite, providing classic cowsay-style output (speech bubble + ASCII art) with a selectable face.

Changes:

• Introduces src/bin/cowsay.zig implementing bubble rendering and -f/--face selection (cow/tux), plus unit tests.
• Registers the new cowsay binary in build.zig so it participates in install/run/test steps.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
src/bin/cowsay.zig	New cowsay command implementation, includes bubble rendering logic and tests.
build.zig	Adds cowsay to the binaries list so it is built and tested.

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[jiacai2050]

@copilot 修复ci的错误

[Copilot]

@copilot 修复ci的错误

Fixed in 4ec7ba1. The issue was that writeSpeechBubble declared writer: *std.Io.Writer, but tests pass a GenericWriter from ArrayList.writer() which is a different concrete type and can't coerce. Changed the parameter to anytype (the idiomatic Zig approach, also used by simargs.printHelp) so it accepts both the *std.Io.Writer from main and the GenericWriter in tests.

[jiacai2050]

@copilot 增加对应文档

[Copilot]

@copilot 增加对应文档

Added in 1915599 — created docs/content/programs/cowsay.org following the same Org-mode format as other commands in the docs, with the help output and demo examples.