Backport GitHub Copilot instructions. (#25953)

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+---
+applyTo: "**"
+excludeAgent:
+  - "coding-agent"
+---
+# GitHub Copilot Instructions for QMK Pull Request Review
+This document provides automated review guidance based on the [QMK PR Checklist](https://docs.qmk.fm/pr_checklist) and it is intended only for use by GitHub Copilot code-review agent during pull request reviews.
+
+## General PR Requirements
+
+### Branch and Submission Standards
+- **Source Branch Policy**: Verify PR is NOT submitted from submitter's own `master` branch
+  - Flag if submitter is using their own `master` branch as source
+  - Suggest using feature branches instead for cleaner fork management
+- **Target Branch Policy**:
+  - **New keyboard additions** → `master` branch (new folders under `keyboards/`)
+  - **All other changes** → `develop` branch:
+    - Keyboard updates, refactors, or moves
+    - Core code changes
+    - Data-driven configuration migrations
+    - Any modifications to existing keyboards
+- **PR Scope**: PRs should contain the smallest set of modifications for a single change
+  - Flag PRs that modify multiple keyboards simultaneously
+  - Suggest splitting large PRs into focused, incremental changes
+- **Merge Conflicts**: Check for unresolved merge conflicts
+
+### File Naming and Structure
+- **Lowercase Requirement**: All new directories and filenames must be lowercase
+  - Exception: Upstream sources with original uppercase (LUFA, ChibiOS)
+  - Exception: Core files with valid justification
+  - **Reject**: Board designer preference for uppercase is NOT valid justification
+
+### License Headers
+- **Required**: Valid license headers on all `*.c` and `*.h` files
+- **Recommended**: GPL2/GPL3 for consistency
+- **Format**: Check for proper GPL2+ header or SPDX identifier
+  ```c
+  // Copyright 2024 Your Name (@yourgithub)
+  // SPDX-License-Identifier: GPL-2.0-or-later
+  ```
+- **Exception**: Simple assignment-only `rules.mk` files don't need headers
+- **Flag**: Missing or ambiguous license headers (blocks merge)
+
+### QMK Best Practices
+- **Include Guards**: Use `#pragma once` instead of `#ifndef` guards in headers
+- **Abstractions Required**: No low-level GPIO/I2C/SPI functions
+  - Must use QMK abstractions (flag direct hardware access)
+- **Timing Functions**:
+  - Use `wait_ms()` instead of `_delay_ms()`
+  - Remove `#include <util/delay.h>`
+  - Use `timer_read()`, `timer_read32()` from `timer.h`
+- **New Abstractions**: If proposing new abstraction, suggest:
+  1. Prototype in own keyboard first
+  2. Discuss with QMK Collaborators on Discord
+  3. Refactor as separate core change
+  4. Remove the keyboard-specific implementation from board
+
+---
+
+## Keymap PR Reviews
+
+**Scope**: These rules apply to files within `keyboards/*/keymaps/*` subdirectories.
+
+### Note on Personal Keymaps
+- **Policy Change**: Personal keymap submissions no longer accepted
+- **Permitted**: Vendor-specific keymaps only
+  - Naming convention: `default_${vendor}` (e.g., `default_clueboard`)
+  - Can be more feature-rich than stock `default` keymaps
+
+### Keymap Code Standards
+- **Includes**: `#include QMK_KEYBOARD_H` preferred over specific board files
+- **Enums**: Prefer layer enums to `#define`s
+- **Custom Keycodes**: First entry must be `QK_USER`
+- **Formatting**: Check spacing alignment on commas and keycodes (spaces, not tabs)
+- **VIA**: Keymaps should NOT enable VIA
+  - VIA keymaps belong in [VIA QMK Userspace](https://github.com/the-via/qmk_userspace_via)
+
+---
+
+## Keyboard PR Reviews
+
+**Scope**: These rules apply to keyboard-level files in `keyboards/*` directories, excluding files within the `keymaps/` subdirectories. This includes:
+- `info.json` or `keyboard.json` (keyboard root or variant level)
+- `readme.md` (keyboard level)
+- `rules.mk` (keyboard level)
+- `config.h` (keyboard level, not keymap level)
+- `<keyboard>.c` and `<keyboard>.h` files
+- Hardware configuration files (`halconf.h`, `mcuconf.h`, `chconf.h`)
+
+### Branch Targeting
+- **New Keyboards**: Target `master` branch
+  - New additions to `keyboards/` folder submit to `master`
+- **Keyboard Moves**: Must target `develop` branch
+  - Check `data/mappings/keyboard_aliases.hjson` is updated for moves
+- **Keyboard Updates/Refactors**: Must target `develop` to reduce merge conflicts
+- **Data Driven Migration**: Must target `develop`
+
+### info.json and keyboard.json Requirements
+- **Data-Driven Configuration**: Encourage maximum use of `info.json` and `keyboard.json` schema features
+- **Schema Validation**: All `info.json` and `keyboard.json` files must validate against `data/schemas/keyboard.jsonschema`
+  - Use QMK CLI: `qmk lint -kb <keyboard_name>` to validate
+  - Schema defines required fields, data types, and valid values
+  - Check for schema validation errors before submitting PR
+- **Mandatory Elements**:
+  - Valid URL
+  - Valid maintainer
+  - Valid USB VID/PID and device version
+  - Displays correctly in Configurator (Ctrl+Shift+I to preview)
+  - `layout` definitions include matrix positions
+  - Standard layout definitions where applicable
+  - Community Layout macro names when applicable
+  - Microcontroller and bootloader specified
+  - Diode direction (if not using direct pins)
+- **Layout Naming**:
+  - Single layout: Use `LAYOUT` or community layout name
+  - Multiple layouts: Include `LAYOUT_all` + alternate names
+  - Prefer community layout names (e.g., `LAYOUT_tkl_ansi`, `LAYOUT_ortho_4x4`)
+- **Configuration in info.json or keyboard.json** (when applicable):
+  - Direct pin configuration
+  - Backlight, Split keyboard, Encoder, Bootmagic configs
+  - LED Indicator, RGB Light, RGB Matrix configs
+- **Format**: Run `qmk format-json -i` before submitting
+
+### USB VID/PID Uniqueness
+VID+PID combination must be unique across all keyboards. Individual VID or PID values can be reused with different partners.
+**Validation Steps:**
+1. Extract VID and PID from keyboard.json/info.json in the PR
+2. Search for existing usage: `grep -r '"vid".*"0xVVVV"' keyboards/ --include="*.json" | grep -l '"pid".*"0xPPPP"'`
+3. If results found: Check if BOTH VID AND PID match in same file
+   - Both match = **COLLISION** - request different PID
+   - Only one matches = **OK** - different keyboards can share individual values
+4. For keyboard variants/revisions under same keyboard folder:
+   - Different PID recommended for functionally different variants
+   - Same PID acceptable if revisions only differ in hardware routing/pin assignments
+**Quick Reference:**
+- Same PID + Different VID = Valid
+- Same VID + Different PID = Valid
+- Same VID + Same PID = Invalid
+**Review Response:**
+For collision:
+```
+VID+PID collision: 0xVVVV:0xPPPP already used by keyboards/[path]/file.json
++Please assign a different PID. VID can remain the same.
+```
+For uniqueness confirmed:
+```
+VID+PID validation: 0xVVVV:0xPPPP is unique (no collisions found)
+```
+
+### readme.md Requirements
+- **Template**: Must follow [official template](https://github.com/qmk/qmk_firmware/blob/master/data/templates/keyboard/readme.md)
+- **Flash Command**: Present with `:flash` at end
+- **Hardware Link**: Valid availability link (unless handwired)
+  - Private groupbuys acceptable
+  - One-off prototypes will be questioned
+  - Open-source should link to files
+- **Reset Instructions**: Clear bootloader mode instructions
+- **Images Required**:
+  - Keyboard and PCB photos preferred
+  - Must be hosted externally (imgur, etc.)
+  - Direct image links required (not preview pages)
+  - Example: `https://i.imgur.com/vqgE7Ok.jpg` not `https://imgur.com/vqgE7Ok`
+
+### rules.mk Standards
+- **Removed Items**:
+  - `MIDI_ENABLE`, `FAUXCLICKY_ENABLE`, `HD44780_ENABLE`
+  - Size comments like `(-/+size)`
+  - Alternate bootloader lists if one specified
+  - MCU parameter re-definitions matching defaults in `mcu_selection.mk`
+- **Comment Updates**: Change bootloader comments to generic
+- **Forbidden Features at Keyboard Level** (these belong in keymap-level `rules.mk` only):
+  - `COMBO_ENABLE`
+  - `ENCODER_MAP_ENABLE`
+
+### config.h Standards (Keyboard Level)
+- **Prohibited**:
+  - `#define DESCRIPTION`
+  - Magic Key Options, MIDI Options, HD44780 configuration
+  - User preference `#define`s (belong in keymap)
+  - Re-defining default values (`DEBOUNCE`, RGB settings)
+  - Copy/pasted comment blocks explaining features
+  - Commented-out unused defines
+  - `#include "config_common.h"`
+  - `#define MATRIX_ROWS/COLS` (unless custom matrix)
+- **Minimal Code**: Only critical board boot code required
+- **No Vial**: Vial-related files/changes not accepted
+
+### Keyboard Implementation Files
+
+#### `<keyboard>.c`
+- **Remove Empty Functions**: Delete empty or commented-out weak-defined functions
+  - `xxxx_xxxx_kb()`, `xxxx_xxxx_user()` implementations
+- **Migration**: `matrix_init_board()` → `keyboard_pre_init_kb()`
+- **Custom Matrix**: Use `lite` variant when possible for standard debounce
+  - `CUSTOM_MATRIX = lite` preferred
+  - Full custom matrix (`yes`) requires justification
+- **LED Indicators**: Prefer Configuration Options over custom `led_update_*()` implementations
+- **Hardware Configuration**: Basic functionality for OLED, encoders, etc. at keyboard level
+
+#### `<keyboard>.h`
+- **Include**: `#include "quantum.h"` at top
+- **Layout Macros**: Move to `info.json` or `keyboard.json` (no longer in header)
+
+### Default Keymap Standards
+
+**Scope**: These rules specifically apply to files within `keyboards/*/keymaps/default/` directories.
+
+- **Pristine Requirement**: Bare minimum clean slate
+  - No custom keycodes
+  - No advanced features (non-exhaustive list of examples: tap dance, macros)
+  - Basic mod taps and home row mods acceptable when necessary
+  - Standard layouts preferred -- see examples in `layouts/default/` and `layouts/community/`
+- **Removed Examples**: Delete `QMKBEST`/`QMKURL` macros
+- **Tri Layer**: Use Tri Layer feature instead of manual `layer_on/off()` + `update_tri_layer()`
+- **Encoder Map**: Use encoder map feature, `encoder_update_user()` may not be present
+- **No VIA**: Default keymap should not enable VIA
+- **Additional Keymaps**: Example/bells-and-whistles keymaps acceptable in same PR (separate from default)
+
+### Prohibited Files
+- **No VIA JSON**: Belongs in [VIA Keyboard Repo](https://github.com/the-via/keyboards)
+- **No KLE JSON**: Not used within QMK
+- **No Cross-Keyboard Sources**: Don't include files from other keyboard vendors
+  - Exception: Core files (e.g., `drivers/sensors/pmw3360.c`)
+  - Use of vendor-specific code (e.g., `wilba_tech/wt_main.c`) only when keyboard exists in the same enclosing vendor folder (e.g. a `wilba_tech` keyboard)
+  - Multi-board code is candidate for core refactoring when intended for use by multiple vendors
+
+### Wireless Keyboards
+- **Policy**: Wireless/Bluetooth PRs rejected without complete wireless code
+  - Wireless code may not include anything resembling precompiled data such as `*.a` files or other libraries
+  - Firmware blobs are not permitted in raw form or as compiled C-style arrays either.
+  - GPL2+ license requires full source disclosure
+  - Historically abused for VIA compatibility without releasing sources
+  - PRs without wireless capability will be held indefinitely
+  - Existing merged wireless boards from same vendor held until sources provided
+
+### ChibiOS-Specific Requirements
+- **Board Definitions**: Strong preference for existing ChibiOS board definitions
+  - Use equivalent Nucleo boards when possible
+  - Example: STM32L082KZ can use `BOARD = ST_NUCLEO64_L073RZ`
+  - QMK is eliminating custom board definitions due to maintenance burden
+- **New Board Definitions**:
+  - Must NOT be embedded in keyboard PR
+  - Submit as separate Core PR
+  - `board.c` must have standard `__early_init()` and empty `boardInit()`
+  	- Migrate code intended for `__early_init()` → keyboard-local `early_hardware_init_pre/post()`
+    - Migrate code intended for `boardInit()` → keyboard-local `board_init()`
+
+---
+
+## Core PR Reviews
+
+### Targeting and Scope
+- **Branch**: All core PRs must target `develop` branch
+- **Single Focus**: Smallest set of changes per PR
+  - PRs with multiple areas will be asked to split
+  - Keyboard/keymap changes only if affecting base builds or default-like keymaps
+  - Keymap modifications (non-default) should be followup PR after core merge
+  - Large refactoring PRs affecting other keymaps raised separately
+
+### Testing Requirements
+- **New Hardware Support**: Requires test keyboard under `keyboards/handwired/onekey`
+  - New MCUs: Add child keyboard targeting new MCU for build verification
+  - New hardware (displays, matrix, peripherals): Provide associated keymap
+  - Exception: If existing keymap can leverage functionality (consult Collaborators)
+- **Callbacks**: New `_kb`/`_user` callbacks must return `bool` for user override
+- **Unit Tests**: Strongly recommended, may be required
+  - Critical code areas (keycode pipeline) will require tests
+  - Boost confidence in current and future correctness
+
+### Code Quality
+- **Subjective Review**: Other requirements at QMK Collaborators' discretion
+- **Documentation**: Core changes should be well-documented
+
+---
+
+## Automated Review Checklist
+
+When reviewing PRs, check the following systematically:
+
+### File Changes Review
+1. **License headers** on all C/H files (GPL2+ preferred, others must be GPL2+ compatible, SPDX format preferred)
+2. **File naming** lowercase (flag exceptions needing justification)
+3. **Include guards** use `#pragma once`
+4. **No low-level hardware access** (GPIO, I2C, SPI direct register writes)
+5. **Timing abstractions** (`wait_ms()`, `timer_read()` usage)
+
+### info.json and keyboard.json Validation
+1. **Schema Compliance**: `keyboard.json` and `info.json` files validate against `data/schemas/keyboard.jsonschema`
+  - Both files are identical syntax, however the `keyboard.json` dictates a buildable target, `info.json` does not
+   - Run `qmk lint -kb <keyboard>` to check schema validation
+   - Check for proper data types (strings, integers, arrays, objects)
+   - Verify required fields are present
+   - Ensure enum values match allowed options in schema
+2. All mandatory fields present and valid
+3. `qmk format-json -i` has been run (formats and validates)
+4. Layout macros moved from headers
+5. Community layout names used where applicable
+
+### rules.mk Cleanup
+1. Deprecated features removed
+2. No size comments
+3. No keymap-only features at keyboard level
+4. No redundant MCU parameter definitions
+
+### config.h Cleanup
+1. No `DESCRIPTION`, `config_common.h`, or prohibited includes
+2. No default value re-definitions
+3. No commented-out defines or feature documentation blocks
+4. No user preference defines at keyboard level
+
+### Keymap Quality
+1. Default keymaps are pristine (no custom keycodes/advanced features)
+2. No `QMKBEST`/`QMKURL` macros
+3. Encoder map feature used instead of `encoder_update_user()`
+4. Tri Layer feature used for multi-layer access
+5. No VIA enabled in default keymap
+
+### Documentation
+1. readme.md follows template
+2. Flash command present with `:flash`
+3. Reset instructions clear
+4. External image hosting (direct links)
+5. Valid hardware availability link
+
+### Code Organization
+1. Empty weak-defined functions removed from `<keyboard>.c`
+2. Proper migration of init functions
+3. No cross-vendor source files
+4. No VIA/KLE JSON files
+
+### Branch and Scope
+1. Not submitted from submitter's own `master` branch (use feature branches)
+2. PR is focused on single change
+3. Targets correct branch:
+   - `master` for new keyboard additions
+   - `develop` for keyboard updates/refactors/moves and core changes
+4. No merge conflicts
+
+---
+
+## Review Response Templates
+
+### For source master branch usage:
+```
+⚠️ This PR appears to be submitted from your own `master` branch. For future PRs, we recommend using feature branches instead of committing to your `master`. This makes it easier to keep your fork updated and manage multiple PRs.
+
+See: [Best Practices: Your Fork's Master](https://docs.qmk.fm/newbs_git_using_your_master_branch)
+```
+
+### For incorrect target branch:
+```
+❌ This PR targets the wrong branch:
+- **New keyboard additions** should target `master`
+- **Keyboard updates/refactors/moves** should target `develop`
+- **Core changes** should target `develop`
+
+Please change the target branch accordingly.
+```
+
+### For missing license headers:
+```
+❌ Missing GPL-compatible license headers on the following files:
+- [list files]
+
+Please add GPL2+ headers (GPL2/GPL3 recommended). Example:
+\`\`\`c
+// Copyright 2024 Your Name (@yourgithub)
+// SPDX-License-Identifier: GPL-2.0-or-later
+\`\`\`
+```
+
+### For non-lowercase filenames:
+```
+❌ The following files/directories must be lowercase:
+- [list files]
+
+Exception: Only valid if from upstream sources (LUFA, ChibiOS) or justified by core consistency.
+```
+
+### For config.h violations:
+```
+⚠️ Found prohibited config.h elements:
+- [list specific issues: DESCRIPTION, default value re-definitions, etc.]
+
+Please remove these and refer to [Data Driven Configuration](https://docs.qmk.fm/data_driven_config).
+```
+
+### For info.json or keyboard.json issues:
+```
+⚠️ info.json or keyboard.json needs attention:
+- [list missing mandatory fields]
+- Please run: \`qmk format-json -i path/to/info.json\` (or keyboard.json)
+- Validate with: \`qmk lint -kb <keyboard_name>\`
+```
+
+### For schema validation errors:
+```
+❌ Schema validation failed for info.json or keyboard.json:
+- [list specific validation errors from schema]
+- Check `data/schemas/keyboard.jsonschema` for valid field definitions
+- Common issues:
+  - Invalid data types (e.g., string instead of integer)
+  - Missing required fields
+  - Invalid enum values
+  - Incorrectly formatted pin definitions
+```
+
+### For non-pristine default keymap:
+```
+⚠️ Default keymap should be pristine (clean slate for users):
+- Remove: [custom keycodes/tap dance/macros/etc.]
+- Keep it minimal with standard layouts where possible
+
+Consider moving advanced features to a separate example keymap.
+```
+
+---
+
+## Notes for GitHub Copilot
+
+- Focus reviews on **objective checklist items** that can be automatically verified
+- Flag **definite violations** with ❌
+- Suggest improvements for **recommendations** with ⚠️
+- **Provide specific file/line references** when flagging issues
+- **Link to relevant QMK documentation** for each issue
+- **Prioritize blocking issues** (license, merge conflicts, branch policy)
+- **Be constructive**: Suggest fixes, not just problems
+- **Acknowledge trade-offs**: Some guidelines have valid exceptions
+
+This is meant as a **first-pass review** to catch common issues before human review. Complex architectural decisions, code quality, and subjective assessments still require human QMK Collaborator review.