chore: simplify plugin readmes, changelogs and manifest descriptions

plugins/snippets/README.md

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+# Snippets
+
+Save commands and notes, then run or paste them into a terminal. Supports variables and sharing.
+
+## Features
+
+- Save commands and notes and sort them into folders.
+- Run a snippet or paste it into a terminal.
+- Use variables like `$HOST` and `$INPUT_1` that are filled in when the snippet runs.
+- Share snippets and folders with other users or roles.
+- Snippets sync between the desktop app and a server.
+
+## Settings
+
+### User
+
+- Collapse folders by default: start each folder closed when you open the Snippets panel.
+
+## Permissions
+
+- `snippets.view`: See your own and shared snippets. Admins and users have it by default.
+- `snippets.create`: Create snippets, notes and folders. Admins and users have it by default.
+- `snippets.edit`: Change snippets and folders. Admins and users have it by default.
+- `snippets.delete`: Delete snippets and folders. Admins and users have it by default.
+- `snippets.share`: Share snippets and folders. Admins and users have it by default.
+
+## Services
+
+Provides to other plugins:
+
+- `snippets.access`: read and run snippets.
+
+## Development
+
+```bash
+npm run build      # build into dist/
+npm run test       # run this plugin's tests
+npm run typecheck  # type-check this plugin
+```
+
+See `packages/plugin-sdk/ARCHITECTURE.md` for the plugin contract.