fix: lead post-run summary with editing the wording, not the look (#60)

[earino]

Summary

Closes #60 (reported by @JamieP44).

The Phase 9 post-run summary already saved tailored-resume.md and cover-letter.md alongside each PDF, and already pointed at the re-render flow. But it buried both behind a "tweak the look" framing that pointed at fonts and spacing — so students who wanted to change the wording before sending didn't see the editable source they already had.

Reframed: the .md sources are now the primary editing path, named explicitly with arrow callouts, led by "these PDFs are a strong starting draft, not the final artifact — they need a personal touch before sending." The Google Docs / Pages / Word / Canva path stays as a secondary option for anyone who prefers a rendered view.

No new features — discoverability and framing fix only.

What the student sees now (SKILL.md Phase 9 summary block)

Before:

💡 Edited a markdown file after this run? Ask me to "re-render the {resume|cover|prep} PDF"
and I'll regenerate just that PDF without re-running the full pipeline.

✨ Want to tweak the look? Open resume.pdf in Google Docs, Pages, Word, or Canva —
they all import PDFs and let you adjust fonts, spacing, and colors with tools
you already know.

After:

✏️  These PDFs are a strong starting draft, not the final artifact — they
need a personal touch before sending. The editable source is saved alongside
each PDF:

   tailored-resume.md  ← your resume, in plain markdown
   cover-letter.md     ← your cover letter, in plain markdown

Edit either file in any text editor (VS Code, TextEdit, Notepad, Vim, the
editor inside this CLI), then ask me to "re-render the {resume|cover|prep}
PDF" — I'll regenerate just that PDF, no AI second pass on your edits.

🎨 Prefer editing in a rendered view? Open resume.pdf in Google Docs, Pages,
Word, or Canva — they all import PDFs directly. Re-export to PDF before
submitting (Google Docs: File → Download → PDF Document).

Test plan

• pytest -q — 459/459 pass on the existing suite
• No SKILL.md structural test pins the changed wording (test_skill_md_prologue.py, test_skill_md_phase6.py, test_skill_md_weak_model_guards.py, test_render_pdf.py all checked)
• Manual: ship a real /resumasher <jd> run end-to-end after merge and read the rendered Phase 9 summary out loud — does the editing-the-wording framing arrive before the Google Docs alternative?

Files changed

• SKILL.md — Phase 9 summary block reworded (~10 lines net)
• CHANGELOG.md — entry under [Unreleased] > Changed crediting @JamieP44 + linking PDF to editable format prompt #60

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