feat(settings): gate the Agents and Harness settings tabs behind enable-chat-v3-agents

[ehayes2000]

Stacked on #6031.

The new Agents and Harness settings tabs (and their sidebar group) were unconditionally visible — useSettingsTabAvailable returned true for both, while sibling tabs sit behind flags (Bots → bot-management, CRM → enable-crm).

This gates both tabs behind enable-chat-v3-agents, the same PostHog flag that already gates the channel agent-mention surfaces (useChatV3AgentsFlag), resolved through the tab config's existing useFeatureFlag pattern. The sidebar group disappears automatically when both items are hidden, and useSettingsTabAvailable is the single gate the settings panel and app sidebar both consult, so nothing else needs touching.

Known behavior while the flag is off: the macrod pairing deep link (/app/settings/harness?pair=CODE) dead-ends — intended for a gated rollout.

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Note

Low Risk
Single gate change in settings tab visibility; no auth or data-path changes, only rollout alignment with an existing feature flag.

Overview
Agents and Harness settings tabs (and the sidebar Agents group when both are hidden) are no longer always shown. They now follow the same enable-chat-v3-agents PostHog flag—and dev override—as channel agent-mention UI, via useFeatureFlag in useSettingsTabAvailable.

With the flag off, users won’t see agent settings they can’t use in chat; direct URLs such as /app/settings/harness?pair=CODE won’t surface those tabs until the flag is on.

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Preview: https://eric-hayes-gate-agent-settings-fuui37.preview.macro.com/app (b04dd5c)