refactor(agent-core-v2): drop the unused AgentPhase status union

[sailist]

Related Issue

None — internal cleanup (dead type removal).

Problem

AgentPhase (a 7-kind union: idle/running/tool_call/retrying/awaiting_approval/interrupted/ended) was declared in agent-core-v2 as the wire shape of agent.status.updated, but nothing ever produced or consumed it: every AgentStatusUpdated emission omits phase, and the single consumer of the event interface never reads it. Three of its kinds (awaiting_approval, interrupted, ended) are not agent-machine states at all — they are echoes of turn domain events and the permission interaction system. The authoritative agent state set is the xstate machine projection (LoopSnapshot.state idle/running + MachineEngineTurnSnapshot.phase running/tool_call/retrying), which flows to clients via the agent.state message and is unaffected by this declaration.

The klient contract also declared phase: z.string().optional() for agent.status.updated — never populated and wrongly typed (the declared AgentPhase was an object, not a string).

What changed

• Removed the unused AgentPhase union and the phase field from AgentStatusUpdatedEvent in packages/agent-core-v2/src/agent/usage/usageEvents.ts (plus the now-unused TurnEndReason import).
• Removed the never-populated phase field from the agent.status.updated schema in packages/klient/src/contract/agent/events.ts.
• Fixed a dead call in apps/kimi-inspect/src/panels.ts: the AgentLoopService panel fetched activitySnapshot, which does not exist on IAgentLoopService; it now fetches snapshot().

No behavior change: agent.state wire turn.status, LoopSnapshot.turn.phase, and all durable turn events are untouched. Phase is derived live from the machine and never persisted, so there is no migration surface.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue (external PRs: the issue must have a maintainer's /approve). — N/A, internal cleanup, no issue.
• I have added tests that prove my feature works. — No new tests: dead-code removal with no behavior change; the existing suite (15655 tests, green remotely) covers regressions.
• Ran gen-changesets skill, or this PR needs no changeset. — No changeset: not user-perceivable.
• Ran gen-docs skill, or this PR needs no doc update. — No doc update needed.

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commit: 2ad3816