feat(input): add codex automation stack

input/templates/.gitignore

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+ResumeCustomizerPrompt.md
+!ResumeCustomizerPrompt.md.example

input/templates/ResumeCustomizerPrompt.md.example

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+# Default instructions for Codex-driven resume customization. Copy this file to
+# `ResumeCustomizerPrompt.md` (without the `.example` suffix) and edit it to
+# override the defaults for your workflow.
+
+I need you to customize my resume for this job description:
+
+. “Act like a recruiter in information technology. What’s missing from this résumé that would stop you from reaching out?”
+. “Rewrite my résumé summary to feel confident, clear, and tailored to this job: [paste job description].”
+. “Turn these bullet points into achievement-focused statements. Add metrics wherever possible.”
+. “Help me reframe a 2-year career gap as growth, not failure.”
+. “Add ATS keywords from this job post without sounding robotic.”
+. “Format this résumé so it’s easy to scan, clean to read, and works on any system.”
+. “Write a short, punchy message I can DM a hiring manager. No desperation, just value.”