feat(output): add wrapper and failed conversion handling

AGENTS.md

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+# Agent Overview
+
+This repository splits work into two coordinated areas:
+
+- `input/` – upstream tooling that prepares role-specific Markdown resumes.
+- `output/` – the conversion pipeline that renders those Markdown files into DOCX/PDF deliverables.
+
+Agents should treat these areas independently so changes can be reasoned about and tested in isolation.
+
+## Working Guidelines
+- Keep shared instructions in this file minimal; place deeper guidance in `input/AGENTS.md` or `output/AGENTS.md` as appropriate.
+- When making automated edits, avoid touching both `input/` and `output/` in the same change set unless the work explicitly spans both pipelines.
+- Resume conversion templates live under `input/templates`. Output services mount them read-only; update templates from the input side and verify with a fresh conversion run.
+- Use conventional commits (`<type>(scope): <message>`) to signal which side of the system a change targets, e.g., `feat(output): add failed-processing bucket`.