refactor(app): complete session startup composition

Move the live-session reset and routing graph, combat and diagnostic command targets, and the sole gameplay input subscriber into Phase 7 before frame publication. Add exact retryable ownership for late bindings so partial startup cannot strand session or component teardown edges.

Co-authored-by: Codex <codex@openai.com>

docs/plans/2026-04-11-roadmap.md

@@ -104,10 +104,11 @@ controllers, selection/radar, landblock publishers, and portal/sky/particle
 resources have transactional phase ownership and exact-owner late bindings.
 I.7 adds the complete streaming/session/hydration/local-player/teleport phase,
 including explicit reversible ownership for every late edge. `GameWindow` is
-now 2,479 raw lines. I.8–I.9, shutdown, canonical soak snapshots, and closeout
-checkpoints J–L remain. The App gate passes 3,420 tests / 3 intentional skips,
-the complete Release suite passes 7,792 tests / 5 skips, and all three I.7
-corrected-diff reviews are clean.
+now 2,149 raw lines after I.8a, which composes the session factory, command
+targets, and sole gameplay input subscriber before frame publication. I.8b–I.9,
+shutdown, canonical soak snapshots, and closeout checkpoints J–L remain. The
+App gate passes 3,424 tests / 3 intentional skips, the complete Release suite
+passes 7,796 tests / 5 skips, and the I.8a corrected-diff review is clean.
 
 This is a behavior-preserving structural program. Severe regressions still get
 root-cause fixes in separate commits; ordinary feature work resumes with M4

docs/plans/2026-05-12-milestones.md

@@ -59,11 +59,12 @@ runtime/world, presentation/effect controllers, selection/radar, landblock
 publishers, and portal/sky/particle resources have transactional phase
 ownership and exact-owner late bindings. I.7 now owns the complete streaming,
 session, hydration, local-player, combat, and teleport startup graph, including
-named reversible late edges. `GameWindow` is 2,479 raw lines. I.8–I.9 and
-checkpoints J–L remain active. Issue #232 tracks process-residency variance in
-the soak without loosening its leak threshold. The App gate passes 3,420 tests
-/ 3 skips, the complete Release suite passes 7,792 tests / 5 skips, and all
-three I.7 corrected-diff reviews are clean.
+named reversible late edges. I.8a adds the focused live-session runtime factory
+and attaches command/input owners before frame publication. `GameWindow` is
+2,149 raw lines. I.8b–I.9 and checkpoints J–L remain active. Issue #232 tracks
+process-residency variance in the soak without loosening its leak threshold.
+The App gate passes 3,424 tests / 3 skips, the complete Release suite passes
+7,796 tests / 5 skips, and the I.8a corrected-diff review is clean.
 
 Carried:
 #153 far-teleport residual, #116 slide-response, the remaining R6 ownership cleanup plus

docs/plans/2026-07-22-gamewindow-slice-8-checkpoint-i-ordered-composition.md

@@ -293,6 +293,10 @@ ledger only after the complete pipeline is live.
   frame-root publication and terminal session start is the active cut. Its
   detailed session-binding, atomic-root, and terminal-start plan is
   [`2026-07-22-gamewindow-slice-8-checkpoint-i8-frame-roots-session-start.md`](2026-07-22-gamewindow-slice-8-checkpoint-i8-frame-roots-session-start.md).
+  I.8a is complete: the session factory, command targets, and sole gameplay
+  input subscriber now belong to Phase 7 and publish before any frame root;
+  `GameWindow.cs` is 2,149 raw lines. I.8b atomic frame-root composition is the
+  active cut.
   Checkpoint I remains active until I.9 closes the complete nine-phase pipeline.
 
 ## 6. Automated acceptance

docs/plans/2026-07-22-gamewindow-slice-8-checkpoint-i8-frame-roots-session-start.md

@@ -1,6 +1,6 @@
 # GameWindow Slice 8 — Checkpoint I.8 Frame Roots and Session Start
 
-**Status:** Active
+**Status:** Active — I.8a complete; I.8b frame-root composition next
 
 **Parent:** `2026-07-22-gamewindow-slice-8-checkpoint-i-ordered-composition.md`
 
@@ -27,6 +27,15 @@ unchanged, so no divergence-register row is added.
 
 ## 2. I.8a — complete session/player composition
 
+**Completed 2026-07-22.** `LiveSessionRuntimeFactory` now owns the exact
+reset/router/command graph without a window reference. Phase 7 publishes the
+session host, exact-owner combat and diagnostic command bindings, and the sole
+gameplay input subscriber before Phase 8 can expose a frame root. Desired
+components have a focused canonical snapshot owner. The component-lifecycle
+handoff into the earlier live-presentation phase is an exact, retryable
+adoption lease, so any later Phase-7 fault rolls it back without stranding or
+replaying teardown.
+
 ### 2.1 Focused session runtime factory
 
 Add `LiveSessionRuntimeFactory` under `AcDream.App/Net`. It owns the existing

docs/plans/2026-07-22-gamewindow-slice-8-composition-lifecycle.md

@@ -29,8 +29,8 @@ audit.
 - [x] H — give terrain atlas, sky shader, retained `UiHost`, and both frame roots
   explicit single ownership and transfer seams.
 - [ ] I — group `OnLoad` into small ordered, fakeable composition phases with
-  transactional partial-acquisition rollback. I.1–I.7 are complete; I.8
-  frame-root publication and terminal session start is active. Detailed plan:
+  transactional partial-acquisition rollback. I.1–I.7 and I.8a are complete;
+  I.8b atomic frame-root publication is active. Detailed plan:
   [`2026-07-22-gamewindow-slice-8-checkpoint-i-ordered-composition.md`](2026-07-22-gamewindow-slice-8-checkpoint-i-ordered-composition.md).
 - [ ] J — move the exact retryable shutdown manifest to a focused lifetime
   owner and prove all partial-load/reentrant/retry paths.