Module readiness 

Output readiness detection — determines when a shell is waiting for input.

Three strategies for detecting that a shell process has finished producing output and is waiting for the next command:

• Timeout: pure silence-based — if N ms pass with no output, we assume ready.
• Prompt: regex-based — scan the tail of output for known prompt patterns.
• Hybrid: try prompt detection first, fall back to silence timeout.

The check() method is stateless and designed for polling loops — the caller owns the timers, we just evaluate the current snapshot.

Structs

ReadinessDetector

Stateless readiness evaluator — called repeatedly in a polling loop.

Enums

ReadinessResult

Result of a readiness check

ReadinessStrategy

The strategy for detecting when a shell is ready for input.