docs(plans): mark D.1+D.2 shipped in post-fix remainders (knowledge loop closed)

D.1 (complete_task refused without writeback) and D.2 (propose_plan
auto-appends writeback step) shipped in 3de359b (v0.5.1), e2e-validated
against the live agent. The knowledge loop is now structurally closed —
no blockers remain. Remaining items (F.1, F.2, C.1, C.2, B.4-B.6, E.1,
E.2) are all friction/cosmetic.

plans/index.md

@@ -17,7 +17,7 @@ went sideways, open an investigation.
 | 2026-07-14 | [Session reliability & UX audit](2026-07-14-session-reliability-and-ux-audit.md) | Done — all 21 fixes deployed |
 | 2026-07-14 | [Tool timeline in sidebar](2026-07-14-tool-timeline-sidebar.md) | Done — deployed v0.3.2 |
 | 2026-07-14 | [Unified agent activity indicator](2026-07-14-unified-agent-indicator.md) | Done — deployed v0.3.3 |
-| 2026-07-14 | [Post-fix session remainders: empty responses & plan drift](2026-07-14-post-fix-session-remainders.md) | In Progress — Phases A + B.1-B.3 + F.3 shipped, e2e-validated, committed (337d577), deployed v0.5.0; Phases C, D, E, F.1-F.2 remain (D.1 next blocker). **PM:** OIDC token-refresh fix (root-cause for empty graphs) implemented, not yet committed/deployed |
+| 2026-07-14 | [Post-fix session remainders: empty responses & plan drift](2026-07-14-post-fix-session-remainders.md) | In Progress — Phases A + B.1-B.3 + F.3 + D.1 + D.2 shipped, e2e-validated, committed (337d577 + 3de359b), deployed v0.5.1. Knowledge loop structurally closed. Phases C, E, F.1-F.2, B.4-B.6 remain (no blockers). **PM:** OIDC token-refresh fix (root-cause for empty graphs) implemented, not yet committed/deployed |
 
 ## Done