selftest: ONEDRIVE-SELFTEST phase, proven against the real OneDrive sync root

New phase chained after UPDATE-SELFTEST (so a full SHOTDECK_PICKER_SELFTEST
chain now prints all five PASS lines) and also runnable standalone via
REDLINE_SELFTEST_PHASE=onedrive, since the harness has no other per-phase
selector.

Points TransportSettings at a NEW "Redline-selftest-<Dubai timestamp>" folder
under the real /Users/.../OneDrive-MMDGROUP sync root (never a fake home tree
— that proves the transport against the actual OneDrive file provider), drives
a seeded session through the OneDrive branch of send(anchor: nil), asserts the
PDF landed, the session archived, and the status starts with "Saved to
OneDrive", then confirms the watcher does NOT report the fresh unmarked PDF
as returned. It then adds a real PDFKit ink annotation to that PDF in place —
what the iPad does — saves it, and confirms the watcher now reports it as
commented. Prints "ONEDRIVE-SELFTEST PASS path=<folder>". Never deletes
anything under OneDrive; the created folder and PDF are left in place.

UserDefaults.standard's transport/oneDriveFolder keys are snapshotted and
restored around the phase, the same pattern runRegionPersistPhase already
uses for CaptureRegion — there is no separate defaults-suite threading
through AppModel/send(), so this is the only way to drive the real send()
path without leaving the real app pointed at the selftest folder afterward.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012ZiTXPbPCSjzPVsfoweAbp

Sources/Shotdeck/main.swift

@@ -7,6 +7,9 @@ import ShotdeckCore
 if ProcessInfo.processInfo.environment["SHOTDECK_SNAPSHOT_DIR"] != nil {
     MainActor.assumeIsolated { PanelSnapshot.runIfRequested() }
 }
+if ProcessInfo.processInfo.environment["REDLINE_SELFTEST_PHASE"] == "onedrive" {
+    MainActor.assumeIsolated { PickerSelfTest.runOneDriveOnlyIfRequested() }
+}
 if ProcessInfo.processInfo.environment["SHOTDECK_PICKER_SELFTEST"] != nil {
     MainActor.assumeIsolated { PickerSelfTest.runIfRequested() }
 }