Stabilize music-social issue rendering by sanitizing commit message and canonicalizing URLs

[Copilot]

The music-social workflow generated malformed issue bodies when commit messages contained multiple lines, causing checklist/link markdown to render incorrectly. This update hardens issue-body composition and normalizes site URLs used in generated social/checklist content.

• Issue-body formatting hardening

  • Use only the first non-empty line of head_commit.message before interpolating into markdown.
  • Prevents multiline commit text from breaking subsequent sections (links, checklist, template blocks).

• Canonical URL normalization in generated content

  • Replaced https://www.davidkrk.com/... with https://davidkrk.com/... in:
    • “Voir music.html en ligne” link
    • publication checklist link
    • social post template lines referencing the site

• Representative change

  const commitMsgRaw = process.env.COMMIT_MSG || 'Mise à jour manuelle';
  const commitMsg = (commitMsgRaw.split(/\r?\n/).find(line => line.trim()) || 'Mise à jour manuelle').trim();

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[Copilot]

Pull request overview

This PR hardens the music-social workflow’s generated GitHub issue body so multiline commit messages do not break Markdown rendering, and updates generated site references to use the bare davidkrk.com URL.

Changes:

• Extracts the first non-empty commit-message line before interpolating it into the issue body.
• Updates generated social/checklist links from www.davidkrk.com to davidkrk.com.

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