Remove non-physics-based semantic validation restrictions for NAV and other operators

- Removed invalid_transition_sequence rule (NAV predecessor restrictions)
- Removed resonance_without_coupling rule (arbitrary RA restrictions)
- Removed expansion_without_coherence rule (arbitrary VAL restrictions)
- Removed self_organization_without_dissonance rule (arbitrary THOL restrictions)
- Removed coupling_without_emission rule (arbitrary UM restrictions)
- Completely rewrote NAV_GUIDE.md to remove all references to semantic restrictions
- Guide now focuses purely on TNFR physics: NAV works after any operator with (θ, νf, ΔNFR)
- All tests pass, previously blocked sequences (THOL→NAV, VAL→NAV) now work correctly

Co-authored-by: fermga <203334638+fermga@users.noreply.github.com>

Author: Copilot