chore(P06): clear checkpoint — milestone v0.11 complete

Milestone v0.11 (Placement Tracking and Audit) complete — shipped as
v0.10.6 (the v0.10.x final = the milestone release). All phases
verified + audited (P6 review SHIP, 0 P0s; D-112 audit PASS); merged
to main via PR #6; v0.10.5 (the deferred per-phase tag) + v0.10.6
(release lane on the tags). The next milestone opens at SPECIFY per
the D-062 rails.

.ciagent/CHECKPOINT.json

@@ -1,9 +0,0 @@
-{
- "phase": 6,
- "stage": "ship_pending",
- "milestone": "v0.11",
- "milestone_name": "placement-tracking",
- "phase_role": "final",
- "attempts": 0,
- "updated_at": "2026-10-22T04:50:00Z"
-}