Three bookkeeping files updated to reflect the v1.2 deliverable:
- metadata.json: deliverable now points at report_v1.2.md; added
deliverable_v1_1, final_commit=213e4994
- tracks.md: track #23 heading shows COMPLETE: 213e4994; status
line lists v1.0 -> v1.1 -> v1.2 history with the 3 v1.2 changes
(rename, postfix heuristic, nagent fix)
- state.toml: added version='v1.2'; deliverable_summary updated with
v1_2, v1_1, v1_0 fields and v1_2_changes list