feat(threads): persist active order across clients

[rynfar]

Active threads previously returned to creation order after reload, and moving between sidebar sections required separate actions. Persist their manual order on the server, expose Move up/down on both mobile lists, and support web dragging across Active, Pinned, Settled and Snoozed with explicit destination cues and cancellation cleanup.

Pylon adaptations preserve migration numbering (new migration 057), archived and live snapshots, provider/Prime lifecycle ownership, delegation and attention indicators, draft discard, project filters and older-server capability guards. Hidden and snoozed order keys stay reserved. Bulk shell updates publish once per batch, while optimistic ordering waits for canonical state and receipts.

Validation: 550 focused tests across 20 files; contracts, client-runtime, server (t3), web, mobile and desktop typechecks; scoped formatting, lint, dependency and export checks. Browser checks cover active reorder/reload persistence, active-to-pinned dragging, Escape cancellation, pin removal and cross-device mobile Move up. Native iOS reused the compatible development binary with the new bundle. Screenshots and motion evidence are below.

Bounded upstream head: 062987b2fb0ef48cc7776d654931bd9f3bcf1f9f. All eight sources adopted with no remaining partial scope:

• 2d645df474f0af5e261edb56a79f7a2a9a2d442e — feat(threads): persist manual active thread order (#9729)
• 6766e682ac1a0aa33020358ba98707f4f8fee467 — feat(mobile): arrange active threads from both thread lists (#9730)
• 4023d93bce3f610349fbf38e991f737c1c5e0c98 — feat(web): drag threads across sections with consistent motion (#9731)
• 9a47c7bd40522977c7df022a5b64759aae7b58e0 — feat(web): simplify sidebar drag destination cues (#9750)
• 490eb17d31d3037930d0e6b549393e9dbcebde60 — fix(web): clarify sidebar drag dividers and empty targets (#10464)
• 4e969f3731aaa590889d74274b3b6dced6d86291 — fix(web): keep sidebar drag dividers clear and gestures smooth (#10453)
• 252df7742047af8a1b859dc652b2f40b639d16b3 — perf(web): keep the sidebar responsive during bulk thread updates (#10413)
• 5b0c923ea3413c038f32ac4c523ae96863443f9f — feat(web): name the drop action while dragging sidebar threads (#10378)

Before / after web arrangement:

Before	After pinning by drag

Mobile arrangement menu (Move up verified across the connected browser):

Drag destination and release motion:

thread-drag.mp4

Implemented and verified by GPT-6 Astra in the Codex desktop harness.

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	13.7 KiB	13.7 KiB	−87 B (−0.6%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.1 KiB	7.1 KiB	+2 B (+0.0%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.6 KiB	6.6 KiB	−89 B (−1.3%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	57.3 KiB	56.5 KiB	−822 B (−1.4%)	66.4 KiB	✅
Codex	Live turn messages	8	8	0 (0.0%)	21	✅
Claude	Total thread wire	13.8 KiB	13.7 KiB	−74 B (−0.5%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.1 KiB	7.1 KiB	+22 B (+0.3%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.7 KiB	6.6 KiB	−96 B (−1.4%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	58.2 KiB	57.4 KiB	−840 B (−1.4%)	66.4 KiB	✅
Claude	Live turn messages	9	9	0 (0.0%)	21	✅

Baseline: 9b8410f · PR result: e3486d2 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 111.2 KiB
• Claude decoded thread snapshot: 111.9 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.