session-title/ — log-backed session-title capability family

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This family derives durable session titles from the session log, with an optional model-backed provider.

Package	Role	ctx key
`session-title/`	Owns title state, fallback behavior, provider registration, and refresh	`ctx.sessionTitle`
`session-title-llm/`	Provides shared model-backed title generation	—
`session-title-first-message-llm/`	Titles a session from its first eligible human message	registers on `ctx.sessionTitle`
`session-title-all-messages-llm/`	Titles a session from all eligible human messages	registers on `ctx.sessionTitle`

Deployments may register one model-backed provider; the service retains a deterministic fallback when none is present.