Preserve connecting status while a turn starts

[D3OXY]

What Changed

Preserve the connecting thread status while provider readiness arrives with a turn start still pending. The thread transitions directly to working once the turn starts instead of briefly appearing inactive.

Why

Status-grouped thread lists currently jump between sections during provider startup because readiness temporarily exposes an idle state.

Fixes #4099

Verification

• vp check
• vp run typecheck
• vp test: lifecycle coverage passed; the unrelated ACP timeout passed 14/14 on targeted retry.

Checklist

• This PR is small and focused
• I explained what changed and why
• UI screenshots included
• Video included

Note

Preserve "connecting" status during turn start in provider session orchestration

• When a turn start is pending, session status is reported as "starting" instead of "ready" to avoid a brief flash of the connected state before the turn begins.
• In ProviderCommandReactor.ts, ensureSessionForThread accepts a new pendingTurnStart flag; the turn.start handler passes this flag to trigger the status override.
• In ProviderRuntimeIngestion.ts, session.state.changed, session.started, and thread.started events check projectionTurnRepository.getPendingTurnStartByThreadId and emit "starting" instead of "ready" when a pending turn start exists.

^{Macroscope summarized bb2e8be.}

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Approvability

Verdict: Approved

Small, focused fix to preserve 'starting' status during turn initialization rather than briefly showing 'ready'. Changes are limited to status mapping logic with clear intent and minimal risk.

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