conductor(tracks): register live_gui_fragility_fixes + queue prior_session_test_harden follow-up

conductor/tracks.md

@@ -152,6 +152,9 @@ User review surfaced five outstanding UI issues, each previously attempted witho
 0. [ ] **Track: Sloppy.py Startup Speedup**
    *Status: 2026-06-05 — Surfaced during regression_fixes_20260605 root-cause analysis. `sloppy.py --enable-test-hooks` startup latency has crept up; live_gui fixtures time out at `wait_for_server(timeout=15)`. Hypothesized cause: too much init work on the main thread (FastAPI hook server bring-up, log pruner retry loops, MCT startup). Plan: profile startup, move heavy init off the main thread to the controller's background thread pool, defer non-critical subsystems to lazy-init on first use. Spec/plan to follow.*
 
+0a. [ ] **Track: prior_session_test_harden_20260605**
+   *Status: 2026-06-05 — Surfaced during live_gui_fragility_fixes_20260605 execution. `test_prior_session_no_pop_imbalance::test_no_extraneous_pop_when_prior_session_renders` is more under-mocked than expected: the imscope.window tuple-unpack error at `src/gui_2.py:2333` was the first of many un-mocked dependencies; fixing it revealed `imgui.begin` returning bool where 2-tuple expected at `src/gui_2.py:4496` (`render_theme_panel`). The test calls `render_main_interface` which is a kitchen-sink function requiring 50+ mocks. Plan: either (a) add the missing 50+ mocks (heavy lift), or (b) refactor the test to exercise a narrow prior-session render path instead of `render_main_interface` (lighter lift; preserves the test's intent of verifying push/pop balance in the prior-session render path). Spec/plan to follow.*
+
 1. [ ] **Track: Bootstrap gencpp Python Bindings**
    *Link: [./tracks/gencpp_python_bindings_20260308/](./tracks/gencpp_python_bindings_20260308/)*
 
@@ -388,4 +391,8 @@ User review surfaced five outstanding UI issues, each previously attempted witho
 *Link: [./tracks/regression_fixes_20260605/](./tracks/regression_fixes_20260605/), Plan: [./../../docs/superpowers/plans/2026-06-05-regression-fixes.md](./../../docs/superpowers/plans/2026-06-05-regression-fixes.md)*
 *Goal: Resolve 21 failing tests surfaced after the multi-themes ship. 11 of 21 fixed across 10 atomic commits: theme regression (`test_gui_progress` C_LBL/C_VAL API change, `38abf231`), pre-existing non-live_gui (`test_gui_phase4` markdown_helper mocks, `df43f158`; `test_view_presets` persona_manager mock, `970f198c`), GUI production bug (`DIR_COLORS` callable, `1469ecac`), live_gui `LogPruner` busy loop (`ac08ee87`), RAG NoneType guard (`c96bdb06`). **Root cause of remaining 10 live_gui failures identified (commit `d7487af4`)**: `imgui.save_ini_settings_to_memory()` at `src/gui_2.py:601` crashes C-level (`0xc0000005`) when called in the first few render frames because ImGui's internal state (Fonts, DisplaySize, Settings) isn't ready. Crash is uncatchable from Python. Fixed with `_ini_capture_ready` flag (defer-not-catch pattern): first call returns `b""` and sets the flag, subsequent calls invoke the C function. Bisect anchors: `7df65dff` (pre-existing failures start), `7ea52cbb` (theme-caused failures start). Deferred follow-up track needed for ~5 remaining live_gui tests (MMA engine state transitions, RAG status timing, one test needing substantial render path mocks).*
 
+- [~] **Track: Live-GUI Fragility Fixes (post regression_fixes ship)** `[checkpoint: 5692cbef]`
+*Link: Plan: [./../../docs/superpowers/plans/2026-06-05-live-gui-fragility-fixes.md](./../../docs/superpowers/plans/2026-06-05-live-gui-fragility-fixes.md), Spec: [./../../docs/superpowers/specs/2026-06-05-live-gui-fragility-fixes-design.md](./../../docs/superpowers/specs/2026-06-05-live-gui-fragility-fixes-design.md)*
+*Goal: Resolve the 3 remaining live_gui failures (269/272 → 271/272 plus 1 new regression unit test). 1-line src fix in `_capture_workspace_profile` (change `ini=b""` to `ini=""` to satisfy `WorkspaceProfile.ini_content: str` contract that `tomli_w` enforces); the `b""` sentinel was a regression from `d7487af4` that caused `save_workspace_profile` to raise `TypeError`, profile never saved, `load_workspace_profile` became a no-op. 1 new unit test (`tests/test_workspace_profile_serialization.py`) encoding the str/bytes contract. `test_prior_session_no_pop_imbalance` is **deferred to a separate follow-up track** — the test was more under-mocked than the spec assumed; fixing imscope.window tuple-return only revealed the next un-mocked dependency (imgui.begin returning bool where 2-tuple expected at line 4496). `render_main_interface` is a kitchen-sink function requiring 50+ mocks; a follow-up track will either add the missing mocks or refactor the test to exercise a narrow prior-session render path. Change 4 (doc hardening of defer-not-catch sections) deferred to track end; not done due to scope focus.*
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 # TODO(Ed): Support "Virtual" Pasted entries for the context.