test(snapshot): reconcile replay overlays with the merged configs and fixtures

- acp/headless whole-config snapshot patches restate persistenceCompression:
  none so raw JSONL fixtures stay harvestable, and re-pin the recorded
  deepseek-v4-flash where the shipped config moved to pro
- depth-two overlay gains the app-config re-pin master's other overlays carry
- headless-agent stays on flash: goal/ralph overlays include it via a nested
  include, which a config patch cannot reach to re-pin
- workspace-context scenarios re-record their session fixtures for the
  per-candidate scope keys and both-siblings loading; acp session fixtures
  otherwise return to master's (session/title + delegationDepth events)

packages/ui/tui/tests/snapshots/surface-before-compaction.expected.txt

@@ -35,8 +35,9 @@ buffer
   style 2-19 dim
 13| "▌ packages/ui/tui 100%                                                          "
   style 0-0 fg=green
-14| "▌ 4016 tests passed                                                             "
+14| "▌ … +1 lines (Ctrl+O to expand)                                                 "
   style 0-0 fg=green
+  style 2-30 dim
 15| "▌ 1 test skipped                                                                "
   style 0-0 fg=green
 16| "▌ coverage complete                                                             "
@@ -52,7 +53,7 @@ buffer
   style 1-1 inverse
 21| "────────────────────────────────────────────────────────────────────────────────"
   style 0-79 dim
-22| "deepseek-v4-flash  /workspace/project  ↑0 ↓0                     tools:collapsed"
+22| "deepseek-v4-flash  /workspace/project  ↑0 ↓0         0% context  tools:collapsed"
   style 0-43 dim
-  style 65-79 dim
+  style 53-79 dim
 23| <blank>