conductor(plan): Mark Phase 4 tasks 4.3-4.6 complete (checkpoint commit + tracks.md row + plan SHAs)

conductor/tracks/default_layout_install_20260629/plan.md

@@ -130,10 +130,10 @@ Focus: full-batch confirmation; per-target test runs; cross-reference the origin
     - VC_no_configs_in_src: 0 .ini files in src/ (PASS via phase4_audit.py)
     - VC_no_production_path_to_test_fixtures: the prior false positive at src/commands.py:371 (the line removed in Phase 3 commit 3b966288) is gone. Remaining hits in src/gui_2.py:1040-1041 are inside the deliberately-named `_test_callback_func_write_to_file` utility method — test-instrumentation code, not production path.
 - [N/A] Task 4.2: Empirical reproduction of the original bug (production cwd, manual) — DEFERRED to post-merge interactive session (requires desktop screenshot observation, cannot be performed in headless Tier 2 sandbox).
-- [x] Task 4.3 [checkpoint: pending]: Checkpoint commit + verification git note (planned after Task 4.4)
-- [~] Task 4.4: Append phase checkpoint + completion SHAs to `plan.md`
-- [ ] Task 4.5: Commit final plan update
-- [ ] Task 4.6: Add row to `conductor/tracks.md`
+- [x] Task 4.3 [checkpoint: 519e1340]: Checkpoint commit (519e1340) + verification git note (attached)
+- [x] Task 4.4 [b80e5afb]: Append phase checkpoint + completion SHAs to `plan.md`
+- [x] Task 4.5 [cf6a2e20]: Commit final plan update + tracks.md row (cf6a2e20 conductor(tracks): add row)
+- [x] Task 4.6 [cf6a2e20]: Add row to conductor/tracks.md (cf6a2e20 — added to Recently Shipped Tracks section)
 
 ## Phase Checkpoints (anchors for review)