diff --git a/.project/objectives/p3-26-complete-headless-simulator.md b/.project/objectives/p3-26-complete-headless-simulator.md
index 661bf40f..ae6692ac 100644
--- a/.project/objectives/p3-26-complete-headless-simulator.md
+++ b/.project/objectives/p3-26-complete-headless-simulator.md
@@ -67,7 +67,18 @@ PvP/siege/lair combat, climate physics+weather+effects, 3 event categories.
 **Backlog (live-only → migrate into `mc-turn`):**
 - [x] **B1 Happiness + Golden Age** ✅ (7993ba7ca — happiness_phase.rs, wired post-economy-loop) — `mc-happiness` exists; tick per-turn (golden-age meter, anarchy).
 - [x] **B2 Unit + city healing** ✅ (7993ba7ca — healing.rs, wired post-climate) — HP regen (in-territory / fortified / city heal).
-- [ ] **B3 Improvements build tick** — `_process_improvements` (build progress, not just yields).
+- [ ] **B3 Improvements subsystem (FULLY ABSENT headless — verified 2026-06-26, not just the build-tick)**:
+  - `TurnProcessor::improvement_yield_table` is on the fresh-per-turn processor and is NEVER
+    populated by `apply_end_turn` (only set manually in unit tests) → `process_improvement_yields`
+    no-ops in real play.
+  - `handle_build_improvement` (action_handlers/mod.rs) is a stub: validates the unit, returns
+    Ok(()), places nothing. The action's `improvement_id` is dropped by the dispatcher.
+  - GameState holds no improvement data; improvement build_turns ARE in the JSON (farm.json etc.).
+  - **Plan (ecology-phase shape):** GameState += improvement yield+build_turns tables (#[serde skip]
+    boot) + `pending_improvements: Vec<{col,row,improvement_id,city_idx,turns_remaining}>`; apply_end_turn
+    loads the tables (or process_improvement_yields reads GameState); dispatch handles BuildImprovement
+    directly (unit tile → owning city via CityState.owned_tiles → push pending w/ build_turns); a
+    build-tick phase decrements + completes into city_improvements[ci]; FFI + harness boot. Full subsystem.
 - [ ] **B4 Government/civics per-turn** — `mc-civics`; (disabled in live too — stub).
 - [ ] **B5 Loot decay** — `mc-city` items; (disabled in live too).
 - [ ] **B6 Equipment/crafting** — `mc-city/recipes.rs`; add headless Craft action + tick (was gap 3).