fix(docs): repair the contributing guide content defects

[hyperpolymath]

Mechanical repairs to .github/CONTRIBUTING.md, each anchored on a specific known-broken form:

• unescaped # -> #
• rebuilt the hard-wrapped setup block into one command per line
• replaced invalid (): commit header
• dedented headings that rendered as code

Why these: they are the classes reviewers keep flagging on this file — template tokens left unsubstituted, commands collapsed onto one line by the AsciiDoc→Markdown conversion so copying them passes extra arguments, \# escapes where # was meant, an invalid (): commit header, and a four-space indent that made headings render as code.

No prose is rewritten; only the broken forms are corrected. If a pattern is not present the file is untouched.

[coderabbitai]

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Reviewing files that changed from the base of the PR and between 787501a and afed1b1.

📒 Files selected for processing (1)

• .github/CONTRIBUTING.md

 _____________________________________________________________
< Jurassic Park would have been a lot shorter with me around. >
 -------------------------------------------------------------
  \
   \   \
        \ /\
        ( )
      .( o ).

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