Inline VS Code loses Settings Sync/auth state on Programa restart (ephemeral port + temp token)

[arzafran]

Tracking upstream cmux manaflow-ai#6595 — applicable to our fork but needs a product/scope decision.

Assessment: Confirmed: launchServeWebProcess at Sources/AppDelegate.swift:973 uses --port 0 and Sources/AppDelegate.swift:1084-1088 creates a UUID-named temp file in NSTemporaryDirectory on every launch. No VSCODE_CLI_USE_FILE_KEYRING, no stable --server-data-dir. VS Code Web gets a fresh server identity on every restart. Fix is small (stable port in UserDefaults, persistent token file in Application Support, VSCODE_CLI_USE_FILE_KEYRING env var) but needs a product decision on committing to a stable VS Code serve-web data directory in Application Support.

Upstream: manaflow-ai#6595

[arzafran]

Decision: Build. Confirmed — serve-web uses --port 0 (AppDelegate.swift:973) and a per-launch UUID temp token file (:1084-1088), no --server-data-dir, no file keyring.

Fix: stable port in UserDefaults, persistent token file in Application Support, add --server-data-dir (stable path) + VSCODE_CLI_USE_FILE_KEYRING=1. Land together with #23. Cleared needs-decision.

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