docs(runbook §footer): next-review pointer v1.1 → v1.3 (REQ-INB-29)

The runbook footer (line 823) still said "Next review: after
the v1.1 ship (2026-06-08, milestone `milestone/v1.1-initial`)"
even though v1.1 has shipped, v1.2 has shipped (tag v1.2.0 on
63c0f59), and v1.3 is in the ideate phase on
milestone/v1.3-initial. The footer pointer was stale by 2
milestones.

This commit updates the footer to "Next review: after the
v1.3 ship (2026-06-08, milestone `milestone/v1.3-initial`)"
so the v1.3 audit trail is consistent. The rest of the
footer (the trailing sentence about divergence) is
preserved verbatim.

---ci---
project: inboxos
phase: 1
milestone: v1.3
status: execute
tasks_completed: [T2.1]
candidates_closed: [REQ-INB-29]
files_touched:
  - docs/operations-runbook.md (1 line, line 823)
---/ci---

docs/operations-runbook.md

@@ -820,4 +820,4 @@ in isolation).
 
 ---
 
-*End of runbook. Next review: after the v1.1 ship (2026-06-08, milestone `milestone/v1.1-initial`), or when the next failure mode is added to §5. Last verified against the source files cited inline; any divergence is a bug in this document — fix the doc, do not just edit around it.*
+*End of runbook. Next review: after the v1.3 ship (2026-06-08, milestone `milestone/v1.3-initial`), or when the next failure mode is added to §5. Last verified against the source files cited inline; any divergence is a bug in this document — fix the doc, do not just edit around it.*