Original session restore with actual saved-position load

RE-902. Reproduce with python3 scripts/analyze_qvm_session_restore.py; focused validation: cargo xtask test-group qvm-session-restore. Machine report.

144 actual247219 compositions execute original scanner, signed atoi, comma search, mode classifier and246554 load. Session scan result is ignored: partial fields and explicitly supplied caller-scratch words determine subsequent values; restored booleans use>0, with the final one also requiring team mode and flag1. Ignore tokens set in-range entries to1 without clearing old entries; invalid text maps to0. Actual saved-position load follows cvar restoration. Engine cvars/file bytes and initial scratch are supplied, not assumed initialized; native ownership and full reload integration remain open.

Original executable/native runtime and complete Linux/macOS Rust/Bevy/Solari acceptance remain unverified.