feat: route folder sync through market-native docs ingest

[adamlevineagent]

Summary

• add per-linked-folder market-native docs ingest mode: off, auto, all
• route upload-side local folder sync through /api/v1/wire/sync when enabled
• expose the setting in FolderLink and planner command docs

Why

This makes Agent Wire Node's file-to-wire sync a real entry surface for the market-native Wire docs ingest chain instead of a one-off migration script. Upload/Both linked folders can now automatically hand docs without rear-matter, or all docs, to the server-side market-native ingest policy.

Verification

• npm run build
• cargo check --bin wire-node-desktop
• cargo test linked_folder_ --lib
• cargo test wire_sync_payload_carries_market_mode_and_file_shape --lib

Notes

• Rust commands produce existing warning noise in unrelated modules.
• This is branch-only for steward/PP review; no direct main push.