diff --git a/Hardware.md b/Hardware.md
index e69de29..61705f5 100644
--- a/Hardware.md
+++ b/Hardware.md
@@ -0,0 +1,79 @@
+# Hardware
+
+## Classification
+
+Hardware / firmware workspace.
+
+## Structure Signals
+
+- `ai brains` (39 files)
+- `p4_gemini_chat` (32 files)
+- `components` (3 files)
+- `(root)` (2 files)
+- `.vscode` (1 files)
+
+## File Type Signals
+
+- `(none)` (11)
+- `.md` (10)
+- `.json` (5)
+- `.txt` (5)
+- `.yml` (4)
+- `.in` (4)
+- `.gitignore` (3)
+- `.ini` (3)
+- `.sh` (3)
+- `.bat` (3)
+- `.c` (3)
+- `.fish` (2)
+
+## Build And Dependency Signals
+
+| Signal | Detail |
+|---|---|
+| CMakeLists.txt | CMake/ESP-IDF style build metadata is present. |
+| README files | README.md, ai brains/esp-idf/README.md, ai brains/esp-idf/README_CN.md |
+
+## Project Tree Snapshot
+
+- ._.gitignore
+- .gitignore
+- .vscode/settings.json
+- ai brains/esp-idf/.codespellrc
+- ai brains/esp-idf/.editorconfig
+- ai brains/esp-idf/.flake8
+- ai brains/esp-idf/.gitignore
+- ai brains/esp-idf/.gitlab-ci.yml
+- ai brains/esp-idf/.gitmodules
+- ai brains/esp-idf/.mypy.ini
+- ai brains/esp-idf/.pre-commit-config.yaml
+- ai brains/esp-idf/.pylintrc
+- ai brains/esp-idf/.readthedocs.yml
+- ai brains/esp-idf/.shellcheckrc
+- ai brains/esp-idf/.vale.ini
+- ai brains/esp-idf/CMakeLists.txt
+- ai brains/esp-idf/COMPATIBILITY.md
+- ai brains/esp-idf/COMPATIBILITY_CN.md
+- ai brains/esp-idf/CONTRIBUTING.md
+- ai brains/esp-idf/Kconfig
+- ai brains/esp-idf/LICENSE
+- ai brains/esp-idf/README.md
+- ai brains/esp-idf/README_CN.md
+- ai brains/esp-idf/ROADMAP.md
+- ai brains/esp-idf/ROADMAP_CN.md
+- ai brains/esp-idf/SECURITY.md
+- ai brains/esp-idf/SUPPORT_POLICY.md
+- ai brains/esp-idf/SUPPORT_POLICY_CN.md
+- ai brains/esp-idf/add_path.sh
+- ai brains/esp-idf/conftest.py
+- ai brains/esp-idf/export.bat
+- ai brains/esp-idf/export.fish
+- ai brains/esp-idf/export.ps1
+- ai brains/esp-idf/export.sh
+- ai brains/esp-idf/install.bat
+- ai brains/esp-idf/install.fish
+- ... 41 more project files not shown
+
+## Interpretation
+
+Treat this repo as hardware-affecting until proven otherwise. Add exact board revision, wiring, flashing command, and recovery procedure before release.