Added AGENTS.md and .editorconfig

AGENTS.md

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+# AGENTS.md - Repository Guidelines for Agentic Coding
+
+## Build & Development Commands
+- `make help` - Show all available targets
+- `make dist` - Create source distribution in dist/
+- `make rpm` - Build RPM package
+- `make podman_rpm` - Build RPM using podman (for MacOS)
+- `make changelog` - Add changelog entry via ./changelog.sh
+- `make clean` - Clean generated files
+- Pre-commit hooks run automatically on commit (see .pre-commit-config.yaml)
+
+## Code Style Guidelines
+- **Shell Scripts**: Use bash syntax, source-safe with `${BASH_SOURCE-}` guard
+- **File Permissions**: profile.d scripts must be 0644 (install -m 0644) - they are sourced, not executed
+- **Line Endings**: LF only (enforced by pre-commit, see .editorconfig)
+- **No trailing whitespace** (enforced by pre-commit, see .editorconfig)
+- **Error Handling**: Use `command -v` instead of `which` for portability
+- **OS Compatibility**: Support both Linux and MacOS with conditional logic
+- **Naming**: Profile.d files use `z-<name>.sh` pattern for alphabetical loading
+- **Licensing**: The Unlicense unless explicitly stated otherwise
+- **Indentation**: 4 spaces for shell scripts (see .editorconfig)
+- **Large Files**: Max 64KB (enforced by pre-commit)