[suite] [improvement] make spec ask the user instead of queuing pending decisions #71

I feel spec should be interactive and not completion-based, so that it does not emit pending decisions: if it is unsure of something, it directly asks me.

Today the skill is completion-oriented by design: a decision it cannot settle goes to a pending-decisions bundle and the run ends BLOCKED, with no separate interactive path. The wanted outcome is that a person present in the run gets asked in chat, the way discussion asks.

Two constraints already hold. Interaction posture is a fixed glossary term, so spec's classification moves with this. And cli/ is on hold, so what this does to the CLI's unattended spec stage is recorded as drift, not repaired. Related: #41, which asks the same of implementation.