PAIDEIA MCP v0.5.2

Adds Alt SDK-aligned batch note handoff.\n\nHighlights:\n- New import_alt_notes tool for batch payloads from alt.notes.getContent.\n- New bootstrap_alt_course tool to initialize a course and import initial Alt notes in one call.\n- Alt SDK example showing selected-note handoff shape.\n- Manifest recipes now prefer batch handoff for Alt lecture imports.\n- Stdio smoke now verifies batch note import.\n\nVerified with:\n- python3 -m pytest -q: 40 passed\n- python3 scripts/smoke_stdio.py: 25 tools, 5 prompts, 2 resources, 16 manifest actions, imported notes: 1