Add ORBISTIUM current accepted-epoch index and object bindings

[midiakiasat]

Summary

This change publishes the current accepted-epoch index and binds the current accepted-epoch object to an explicit machine-readable current entry surface.

Published surfaces

• epochs/current/index.json
• tests/test_accepted_epoch_minimum.py
• tests/verify_accepted_epoch_minimum.py

Why this change

ORBISTIUM must let an outsider identify the current accepted epoch from objects rather than prose alone. This change adds the missing current accepted-epoch index and verifies that the accepted-epoch object, current epoch surface, current graph surface, trust summary, contradiction surface, repair surface, quarantine surface, digest surface, and historical archive remain explicitly bound.

Boundary

This change does not mutate accepted state.
It does not create a second epoch line.
It does not replace the accepted-epoch object.
It does not replace graph, trust-summary, contradiction, repair, quarantine, or digest surfaces.
It does not elevate reports, projections, or indexes above the accepted epoch.

Verification

• python3 tests/verify_accepted_epoch_minimum.py

[verifrax-systems]

Governed review completed. Current accepted-epoch index, current-state bindings, and outsider-readable accepted-epoch surfaces are consistent with the active canonical world-state boundary.