refactor(tui): replace v2 sync with data context

[thdxr]

Summary

• replace the sync-v2 context with a private, domain-oriented DataProvider
• migrate agent, model, provider, location, reference, and connectivity consumers to useData
• preserve configured-reference autocomplete and refresh it from reference.updated events
• remove the obsolete experimental v2 session debug plugin
• rename and update the provider test suite

Naming

• no SyncV2, syncV2, useSyncV2, SyncProviderV2, or sync-v2 references remain under packages

Validation

• bun typecheck in packages/tui
• bun typecheck in packages/opencode
• bun test test/cli/tui/data.test.tsx: 6 passed
• repository-wide pre-push typecheck: 23 packages passed
• tmux smoke test confirmed the normal TUI prompt renders, focuses, and accepts input

[greptile-apps]

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