docs: add repository entry point and agent guidance

AGENTS.md

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+<!--
+SPDX-FileCopyrightText: 2026 LibreCode coop and contributors
+SPDX-License-Identifier: CC-BY-3.0
+-->
+
+# Agent guidance
+
+## Purpose
+
+This repository owns public human documentation for LibreSign.
+
+## Boundaries
+
+- LibreSign application code lives in `LibreSign/libresign`.
+- Canonical release history/changelog data lives only in `LibreSign/libresign/docs/changelogs/changelog-<major>.md`; do not duplicate it here.
+- Document public behavior, operator procedures, architecture intended for maintainers and recovery/troubleshooting.
+- Do not copy implementation details that are better maintained next to the source code.
+- Generated Sphinx output must not be committed unless the repository explicitly tracks that output.
+
+## Documentation structure
+
+Keep changes in the appropriate manual:
+
+- `user_manual/`;
+- `admin_manual/`;
+- `developer_manual/`;
+- `main/` for top-level navigation.
+
+## Quality gates
+
+Build the affected Sphinx manuals. Pull requests should pass the Documentation workflow; developer documentation is built with warnings treated as errors.
+
+## Licensing
+
+Preserve the documentation-specific Creative Commons licensing and existing SPDX conventions. Do not silently relicense documentation under the application/code license.
+
+## Safety
+
+Do not publish secrets, private security-advisory content or personal data in examples, screenshots or release documentation.

README.md

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+<!--
+SPDX-FileCopyrightText: 2026 LibreCode coop and contributors
+SPDX-License-Identifier: CC-BY-3.0
+-->
+
+# LibreSign documentation
+
+Source repository for the public LibreSign documentation published at https://docs.libresign.coop.
+
+The repository contains user, administrator and developer documentation built with Sphinx. Product source code and canonical release changelogs live in `LibreSign/libresign`; this repository documents how LibreSign is used, operated and maintained.
+
+## Start here
+
+- Main documentation: `main/`
+- User manual: `user_manual/`
+- Administrator manual: `admin_manual/`
+- Developer manual: `developer_manual/`
+- Local documentation dependencies: `requirements.txt`
+
+Use the repository's documentation workflow to validate changes before merging.