A pure PNG sprite decoder that extracts pixel data from PNG assets (characters, floors, walls, carpets, pets) without external image libraries. It handles palette-based and truecolor PNGs, decodes IDAT chunks, and produces raw RGBA arrays suitable for Canvas rendering. This module has zero internal dependencies and can be extracted into any project requiring lightweight PNG sprite loading.

A finite state machine for pet characters with IDLE, WALK, and FOLLOW states, driven by timer transitions and stubbed random decisions for testability. The pet follows its owner character around the office, with configurable speed and animation timing. This is a self-contained game AI pattern that could be reused in any 2D sprite-based project requiring simple follower NPCs.

A collection of pure functions for editing the office layout (paint floors/walls, place/remove/rotate furniture, paint carpets, define areas). Every function returns a new layout object without mutation, enabling undo/redo via a simple stack. The functions are parameterized over the tile map and furniture catalog, making them reusable for any grid-based map editor.

An in-memory observable store for agent state that supports typed mutations, event broadcasting, and file persistence. It maintains a map of agent IDs to agent state objects and emits events on state changes (add, update, remove). The store is dependency-injected and could be extracted as a generic observable state container for any real-time application.

A path normalization utility that converts filesystem paths to a canonical key using `realpath.native` for case-insensitive Windows compatibility. It provides a `PathSet` class for deduplication and set operations on normalized paths. This is a standalone module solving a cross-platform path identity problem common in developer tools.

A line-by-line JSONL parser for Claude Code session transcripts that extracts tool usage, turn duration, team metadata, and background agent launches. It handles multiple record formats (tool_use, tool_result, queue-operation, team metadata) and normalizes them into a common event structure. The parser is parameterized over record types and could be adapted for any JSONL-based log format.

A set of pure functions for colorizing pixel-art sprites: `colorizeSprite` applies a palette swap, `adjustSprite` performs HSL adjustments, and `flatColorizeSprite` does flat tinting. These functions operate on raw RGBA pixel arrays and are independent of any rendering framework. They could be extracted into any project requiring runtime sprite recoloring.

A provider-agnostic consent gate for first-run hook installation. It implements a state machine with states (undecided, consented, denied, revising) and handles concurrent access, failed installations, and preference persistence. The gate is designed to be reused by any CLI provider that needs user consent before modifying configuration files.

A namespaced file-based persistence adapter that stores state as JSON files under `~/.pixel-agents/`. It provides atomic reads and writes with backup, and supports multiple namespaces (agents, layout, settings). The adapter implements a `StateAdapter` interface and could be swapped for other backends (VS Code, browser local storage) without changing the runtime.

An implementation of the `MessageTransport` interface using VS Code's postMessage API for communication between the webview and the extension host. It handles the ready/lifecycle state and serializes/deserializes typed messages. Together with `webSocketTransport.ts`, it demonstrates a clean transport abstraction that could be extended for other communication channels (e.g., stdin/stdout, HTTP long-poll).