logiguard fork: GPUI xdg-activation keyboard-focus serial fix

Single-commit orphan branch: full zed-industries/zed @ 8c74db0 source tree
with a 3-file patch applied (no upstream history).

Patch (crates/gpui_linux/src/linux/wayland/):
  - serial.rs: add SerialKind::KeyboardEnter
  - client.rs: store wl_keyboard.enter serial; add latest_serial_of()
  - window.rs: activate() uses keyboard-enter serial (Mutter focus gate)

Mutter honors window activation only when the token carries the keyboard-
focus serial from wl_keyboard.enter; GPUI used a stale mouse-press serial.
See docs/tray-window-focus-wayland.md in logiguard.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/src/ai/rules.md

@@ -0,0 +1,77 @@
+---
+title: AI Rules in Zed - .rules, .cursorrules, CLAUDE.md
+description: Configure AI behavior in Zed with .rules files, .cursorrules, CLAUDE.md, AGENTS.md, and the Rules Library for project-level instructions.
+---
+
+# Using Rules {#using-rules}
+
+Rules are prompts that can be inserted either automatically at the beginning of each [Agent Panel](./agent-panel.md) interaction, through `.rules` files available in your project's file tree, or on-demand, through @-mentioning, via the Rules Library.
+
+## `.rules` files
+
+Zed supports including `.rules` files at the root of a project's file tree, and they act as project-level instructions that are auto-included in all of your interactions with the Agent Panel.
+
+Other names for this file are also supported for compatibility with other agents, but note that the first file which matches in this list will be used:
+
+- `.rules`
+- `.cursorrules`
+- `.windsurfrules`
+- `.clinerules`
+- `.github/copilot-instructions.md`
+- `AGENT.md`
+- `AGENTS.md`
+- `CLAUDE.md`
+- `GEMINI.md`
+
+## Rules Library {#rules-library}
+
+The Rules Library is an interface for writing and managing rules.
+It's a full editor with syntax highlighting and all standard keybindings.
+
+You can also use the inline assistant right in the rules editor, allowing you to get quick LLM support for writing rules.
+
+### Opening the Rules Library
+
+1. Open the Agent Panel.
+2. Click on the Agent menu (`...`) in the top right corner.
+3. Select `Rules...` from the dropdown.
+
+You can also open it by running the {#action agent::OpenRulesLibrary} action or through the {#kb agent::OpenRulesLibrary} keybinding.
+
+### Managing Rules
+
+Once a rules file is selected, you can edit it directly in the built-in editor.
+Its title can be changed from the editor title bar as well.
+
+Rules can be duplicated, deleted, or added to the default rules using the buttons in the rules editor.
+
+### Creating Rules {#creating-rules}
+
+To create a rule file, simply open the `Rules Library` and click the `+` button.
+Rules files are stored locally and can be accessed from the library at any time.
+
+For guidance on writing effective rules:
+
+- [Anthropic: Prompt Engineering](https://platform.claude.com/docs/en/build-with-claude/prompt-engineering/overview)
+- [OpenAI: Prompt Engineering](https://platform.openai.com/docs/guides/prompt-engineering)
+
+### Using Rules
+
+You can @-mention every rule created through the Rules Library.
+This allows you to quickly reach for reusable prompts, saving the time to type them out every time you need to use them.
+
+#### Default Rules {#default-rules}
+
+All rules in the Rules Library can be set as a default rule, which means they’re automatically inserted into context for every new Agent Panel interaction.
+
+You can set any rule as the default by clicking the paper clip icon button in the top-right of the rule editor in the Rules Library.
+
+## Migrating from Prompt Library
+
+Previously, the Rules Library was called the "Prompt Library".
+The new rules system replaces the Prompt Library except in a few specific cases, which are outlined below.
+
+### Slash Commands in Rules
+
+Previously, it was possible to use slash commands (now @-mentions) in custom prompts (now rules).
+There is currently no support for using @-mentions in rules files.