Facade Pattern

Provides a simplified interface to a complex subsystem, hiding internal complexity behind a cohesive API. Clients interact with the facade rather than individual components.

ikigai Application

Primary facade: ik_repl_ctx_t is a facade over:

• Terminal management (ik_term_ctx_t)
• Scrollback buffer (ik_scrollback_t)
• Input handling (ik_input_buffer_t)
• Layer rendering system
• LLM client interaction
• Conversation state

User sees: ik_repl_init(), ik_repl_run(), ik_repl_cleanup()

Subsystems hidden: Terminal raw mode, ANSI escapes, viewport calculations, streaming chunk assembly.

Benefit: Main only knows about REPL. REPL orchestrates everything else. Changes to internals don't affect main.