docs: add AGENTS.md and GEMINI.md symlink

AGENTS.md

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+## Commands
+```bash
+# Run linting with warnings treated as errors (required by CI)
+cargo clippy --all-targets --all-features -- -D warnings
+
+# Run all tests
+cargo test
+
+# Run the application (requires Ankama Games' Wakfu assets)
+vakfu --path /path/to/Wakfu --map <map_id>
+```
+
+## Boundaries
+### Always do
+- Run `cargo clippy --all-targets --all-features -- -D warnings` and `cargo test` before submitting a PR.
+- Install required system dependencies (`libwayland-dev`, `pkg-config`, `libxkbcommon-dev`, `libasound2-dev`, `libudev-dev`) before building in a fresh environment.
+
+### Ask first
+- Modifying `Cargo.toml` dependencies.
+
+### Never do
+- Prefer third-party actions like `dtolnay/rust-toolchain` over just invoking builtin commands like `rustup toolchain install stable --profile minimal --component clippy --no-self-update` for GitHub Actions workflows.
+
+## Project Structure
+```text
+src/main.rs       # Application entry point, CLI argument parsing, Bevy App setup
+src/assets.rs     # Asset loaders, handling Tgam (textures), Map chunks and elements, sprites
+src/render.rs     # MapRenderer resource, responsible for efficiently querying/rendering elements via RTree
+src/camera.rs     # Camera controls
+src/settings.rs   # Map View Settings and UI logic
+```
+
+## Testing
+- **Framework:** `cargo test`
+
+## Git Workflow
+Branch naming:
+  feat/[short-description]
+  fix/[short-description]
+  chore/[short-description]
+
+Commit format: [prefix]: [what changed in imperative mood]
+  Example: feat: add DWARF v5 support for symbols

GEMINI.md

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+AGENTS.md