Add AGENTS.md, CODEOWNERS, and PR template for agent-first readiness (#188)

Author: miguelcalderon

.github/CODEOWNERS

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+# Default owners
+* @PSPDFKit/web @PSPDFKit/web-de-support

.github/pull_request_template.md

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+## What
+
+<!-- Brief description of the change -->
+
+## Type
+
+<!-- Check one -->
+- [ ] New playground snippet
+- [ ] New local example
+- [ ] New external link / resource
+- [ ] Update to existing content
+- [ ] Repo infrastructure (CI, docs, tooling)
+
+## Checklist
+
+- [ ] `npm run format` passes
+- [ ] README/index updated where needed (category index and/or root README)
+- [ ] Example has a `README.md` with description and quick start (if local example)
+- [ ] Local example documents its run command and runs successfully with its documented script (if local example)
+- [ ] No duplicate content (not both playground snippet and local example for the same use case)

AGENTS.md

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+# Agent Guide: awesome-nutrient
+
+Curated collection of Nutrient examples, demos, and resources.
+This is **not** an SDK repository.
+
+## Start Here
+
+Before making changes, inspect these files instead of relying on this guide as a second source of truth:
+
+- `README.md` — top-level catalog, content taxonomy, and main entry points
+- `playground/README.md` — Playground-specific organization and navigation
+- The nearest category `README.md` under `web/` (or another platform folder) — local conventions and example index
+- The example's own `README.md` and `package.json` — setup and run instructions
+- `package.json` — repo-level scripts
+- `biome.json` — formatting and linting rules
+- `.github/workflows/` — CI checks
+- `DISCLAIMER.md` — support expectations for this repo
+
+Do not duplicate the contents of those files here.
+
+## Contribution Types
+
+Choose the right kind of contribution for the content you are adding:
+
+| Type | Use When | Primary Location |
+|------|----------|------------------|
+| **Playground snippet** | Small, browser-based examples that should run instantly with no local setup | `playground/` |
+| **Runnable local example** | Multi-file examples intended to be installed and run locally | Platform/category folders such as `web/` |
+| **External link / catalog entry** | The canonical implementation or documentation lives in another repo or on nutrient.io | Relevant README/index file |
+
+If unsure, prefer linking to the canonical source over creating a duplicate copy here.
+
+## Playground Snippets
+
+For Playground work:
+
+- Start in `playground/README.md`
+- Follow the existing category structure under `playground/`
+- Update the relevant `playground/web-*.md` index file so the snippet remains discoverable
+- Use `playground/package.json` and `playground/tsconfig.json` as the source of truth for validation
+
+## Runnable Local Examples
+
+For local examples:
+
+- Follow the conventions already used in the folder you are editing
+- Add or update the example's own `README.md` with a short description and quick start
+- Update the nearest category `README.md` so the example is discoverable
+- If needed, update the root `README.md` when adding a new top-level category or notable entry point
+- Do **not** assume every example uses the same run script — inspect that example's `package.json`
+
+## Contribution Rules
+
+- Keep changes focused and easy to discover
+- Update the relevant README/index whenever you add, remove, move, or rename content
+- Prefer canonical links over duplicated code when appropriate
+- Preserve naming and folder conventions used in the area you are editing
+- Use `@nutrient-sdk/viewer` for new Web SDK examples instead of legacy `pspdfkit`
+- Do not add guidance or claims that conflict with `DISCLAIMER.md`
+
+## Validation
+
+Before opening a PR:
+
+- Run the relevant repo-level or example-level scripts from `package.json`
+- Verify changed links and referenced paths
+- Check `.github/workflows/` if CI expectations are unclear
+- Run formatting via the repo's documented scripts when applicable