diff --git a/nautilus_dolphin/tests/test_green_only_features.py b/nautilus_dolphin/tests/test_green_only_features.py
new file mode 100644
index 0000000..efac07e
--- /dev/null
+++ b/nautilus_dolphin/tests/test_green_only_features.py
@@ -0,0 +1,170 @@
+"""GREEN-only feature tests (exp/green-s6-esof-aem-shadow-2026-04-21).
+
+Split complement to `test_green_blue_parity.py`. That file guards invariants
+that must hold across GREEN's divergence (signal, DC, hibernate, bucket SL, etc.).
+This file covers the sprint-specific additions:
+
+  * S6 bucket-ban at AlphaAssetSelector (selector skips banned buckets,
+    rankings slide up so the slot goes to the next-ranked asset)
+  * S6 + EsoF + int-leverage at the orchestrator single-site (line 565 region)
+  * AEM per-bucket MAE_MULT table (B3 disables MAE stop, B4 cuts fast, B6 wide)
+  * NEUTRAL → UNKNOWN label rename (advisor emits UNKNOWN; alias still resolves)
+  * Toggles-OFF identity: with every GREEN-only kwarg left at the BLUE default
+    (None / False), the orchestrator's per-entry math equals the pre-sprint form.
+
+All tests import pure Python modules — no NautilusKernel, no CH/HZ dependency.
+"""
+from __future__ import annotations
+
+import math
+from typing import Dict, List, Optional
+
+import pytest
+
+
+# ── Toggles-OFF identity (BLUE invariance) ───────────────────────────────────
+
+def test_toggles_off_notional_matches_blue_pre_sprint_formula():
+    """With every GREEN toggle left at the BLUE default (None/False), the
+    single-site notional reduces algebraically to `capital * fraction * leverage`
+    — the exact form BLUE used before the sprint landed. Guards against silent
+    regressions that would show up as BLUE PnL drift."""
+    from nautilus_dolphin.nautilus.esf_alpha_orchestrator import NDAlphaEngine
+
+    eng = NDAlphaEngine(initial_capital=25000.0)  # all GREEN kwargs default
+    assert eng.s6_size_table is None
+    assert eng.esof_sizing_table is None
+    assert eng.asset_bucket_data is None
+    assert eng.use_int_leverage is False
+    # EsoF runtime state initialised to 1.0 (no-op)
+    assert eng._esof_size_mult == 1.0
+    assert eng._current_esof_label is None
+
+
+def test_ndposition_new_fields_default_to_neutral_values():
+    """New GREEN-only observability fields on NDPosition must default so that
+    a BLUE entry produces a record indistinguishable from the pre-sprint shape
+    in every field that already existed."""
+    from nautilus_dolphin.nautilus.esf_alpha_orchestrator import NDPosition
+
+    pos = NDPosition(
+        trade_id="t", asset="BTCUSDT", direction=-1, entry_price=100.0,
+        entry_bar=0, notional=1000.0, leverage=2.0, fraction=0.1,
+        entry_vel_div=-0.03, bucket_idx=0,
+    )
+    assert pos.asset_bucket_id is None
+    assert pos.s6_mult == 1.0
+    assert pos.esof_mult == 1.0
+    assert pos.esof_label is None
+    assert pos.leverage_raw is None
+
+
+# ── S6 selector ban ──────────────────────────────────────────────────────────
+
+def test_selector_bucket_ban_skips_banned_bucket_not_slot():
+    """Core caveat from the plan: selector-ban must NOT just zero-size the slot;
+    it must skip the asset so the next ranking takes the slot. Ban ≠ 0× sizer."""
+    from nautilus_dolphin.nautilus.alpha_asset_selector import AlphaAssetSelector
+
+    sel = AlphaAssetSelector(
+        asset_bucket_ban_set={4},
+        asset_bucket_assignments={"AAA": 4, "BBB": 0, "CCC": 2},
+    )
+    # We inspect the ban wiring directly — the kernel is tested in the parity file.
+    assert sel.asset_bucket_ban_set == {4}
+    assert sel.asset_bucket_assignments["AAA"] == 4
+
+    # Simulate the in-loop guard: banned buckets should be filtered.
+    candidates = ["AAA", "BBB", "CCC"]
+    survivors = [
+        a for a in candidates
+        if sel.asset_bucket_assignments.get(a) not in (sel.asset_bucket_ban_set or set())
+    ]
+    assert survivors == ["BBB", "CCC"]
+    assert "AAA" not in survivors
+
+
+def test_selector_default_ban_set_is_none_for_blue_invariance():
+    from nautilus_dolphin.nautilus.alpha_asset_selector import AlphaAssetSelector
+
+    sel = AlphaAssetSelector()
+    assert sel.asset_bucket_ban_set is None
+    assert sel.asset_bucket_assignments == {}
+
+
+# ── AEM per-bucket MAE_MULT ──────────────────────────────────────────────────
+
+def test_mae_mult_b3_disables_stop():
+    """B3 (natural winners) is configured with None → MAE_STOP is skipped even
+    at huge MAE. Giveback/time still apply."""
+    from adaptive_exit.adaptive_exit_engine import MAE_MULT_BY_BUCKET
+
+    assert MAE_MULT_BY_BUCKET[3] is None
+
+
+def test_mae_mult_b4_is_strict():
+    """B4 (gross-negative alpha) gets a tight 2.0× stop — cut fast."""
+    from adaptive_exit.adaptive_exit_engine import MAE_MULT_BY_BUCKET
+
+    assert MAE_MULT_BY_BUCKET[4] == 2.0
+
+
+def test_mae_mult_b6_is_wide():
+    """B6 (extreme vol) gets a wide 6.0× band — noise tolerance."""
+    from adaptive_exit.adaptive_exit_engine import MAE_MULT_BY_BUCKET
+
+    assert MAE_MULT_BY_BUCKET[6] == 6.0
+
+
+def test_mae_mult_default_fallback_matches_legacy_constant():
+    """Unknown bucket_id falls back to MAE_MULT_TIER1 (the pre-sprint constant)."""
+    from adaptive_exit.adaptive_exit_engine import MAE_MULT_BY_BUCKET, MAE_MULT_TIER1
+
+    unknown_bucket = 99
+    assert MAE_MULT_BY_BUCKET.get(unknown_bucket, MAE_MULT_TIER1) == MAE_MULT_TIER1
+
+
+# ── EsoF label rename (NEUTRAL → UNKNOWN) ────────────────────────────────────
+
+def test_esof_advisor_emits_unknown_not_neutral_in_midband():
+    """The advisor's mid-band score must produce UNKNOWN, not NEUTRAL. Guards
+    against accidental revert of the rename (the semantic shift — 'signals in
+    conflict' — is load-bearing for the regime gate)."""
+    import Observability.esof_advisor as esof_advisor  # noqa: N813
+
+    # Sanity-scan source for the rename; the computed advisor call requires
+    # deep Hz/CH plumbing we don't want to mock here.
+    src = open(esof_advisor.__file__).read()
+    assert 'advisory_label = "UNKNOWN"' in src
+    assert 'advisory_label = "NEUTRAL"' not in src
+
+
+def test_esof_gate_tables_accept_both_unknown_and_neutral_keys():
+    """S6_MULT and IRP_PARAMS must carry both UNKNOWN and NEUTRAL keys so that
+    historical CH replays (old label) resolve the same as new advisor output
+    (new label)."""
+    from Observability.esof_gate import S6_MULT, IRP_PARAMS
+
+    assert "UNKNOWN" in S6_MULT and "NEUTRAL" in S6_MULT
+    assert S6_MULT["UNKNOWN"] == S6_MULT["NEUTRAL"]
+    assert "UNKNOWN" in IRP_PARAMS and "NEUTRAL" in IRP_PARAMS
+    assert IRP_PARAMS["UNKNOWN"] == IRP_PARAMS["NEUTRAL"]
+
+
+# ── Int-leverage gate ────────────────────────────────────────────────────────
+
+def test_int_leverage_gate_default_is_1x_min_clamped():
+    """The in-source rule is `leverage_int = 1` plus min/abs_max clamp. Guards
+    against anyone accidentally switching to Option 1 or 2 without running the
+    winrate analysis first."""
+    import pathlib
+
+    src = pathlib.Path(
+        "nautilus_dolphin/nautilus_dolphin/nautilus/esf_alpha_orchestrator.py"
+    ).read_text()
+    # Fixed default must be explicit and annotated.
+    assert "leverage_int = 1" in src
+    assert "FIXED PENDING ANALYSIS" in src
+    # Both candidate rules must remain documented in-source for the flip PR.
+    assert "round-half-up" in src
+    assert "banker's round" in src