docs: add project agents guidance

AGENTS.md

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+# AGENTS
+
+## Memory Bank Requirements
+- **Always read the Memory Bank before starting any task.**
+- Memory Bank lives in `memory-bank/` and contains:
+  - `projectbrief.md`
+  - `productContext.md`
+  - `systemPatterns.md`
+  - `techContext.md`
+  - `activeContext.md`
+  - `progress.md`
+- The Memory Bank is the single source of project context. If a user requests **update memory bank**, review every file in the directory before making changes.
+- After significant work or when insights are gained, update `activeContext.md` and `progress.md`. Create additional files in `memory-bank/` when useful for organizing new documentation.
+
+## Development Guidelines
+- **Language:** Go using modules.
+- **Formatting:** run `gofmt -w` on modified Go files.
+- **Testing:** practice TDD and run `go test ./...` before committing.
+- **Linting:** run `golangci-lint run` when available.
+- **Structure:** keep application code inside `internal/` packages and follow existing patterns for `core`, `tui`, and `utils`.
+- **Error Handling:** return errors instead of panicking and provide clear messages.
+
+## Commit Process
+- Ensure Memory Bank is updated when project state changes.
+- Run the formatting, lint, and test commands above.
+- Commit only when the worktree is clean and all commands pass.