Restore TURD detection for current planner dumps

[ApocDev]

Current pypostprocessing planner dumps still produce TURD master, sub-tech, and turd-select-* gate technologies, but no longer attach the nonstandard is_turd property to master prototypes. PyOps imports is_turd only from that removed property, so freshly synced Py datasets report hasTurd: false, hide the TURD navigation, and return no TURD upgrades.

The stable planner shape remains: each selectable sub-tech has prerequisites [master, turd-select-<sub-tech>].

Fix

• Infer TURD master technologies during import from that prerequisite pair.
• Continue honoring explicit is_turd for backward compatibility and fixtures.
• Add importer regression coverage for both inferred and non-TURD technologies.
• Update the schema/data-pipeline explanation.
• Re-sync or re-import the current Py dataset and verify the TURD page returns the expected masters.

Done when

• Current Py 3.1 planner dumps mark the inferred TURD masters.
• dataCapabilities().hasTurd is true after import.
• The TURD navigation and board appear for a synced Py dataset.
• Import and query tests pass.