diff --git a/backend_old/src/edcmbone/__init__.py b/backend_old/src/edcmbone/__init__.py
index ef5c367..50b5f44 100644
--- a/backend_old/src/edcmbone/__init__.py
+++ b/backend_old/src/edcmbone/__init__.py
@@ -1,3 +1,4 @@
+# ratios: loc_comments=28:7 imports_exports=3:1 calls_definitions=0:0
 __version__ = "0.1.0"
 
 from .canon import CanonLoader
@@ -35,3 +36,4 @@
     "A_MATRIX", "PROJECTION_MAP", "ALERT_THRESHOLDS", "RISK_TO_ALERT",
     "MATRIX_VERSION", "freeze", "diff",
 ]
+# ratios: loc_comments=28:7 imports_exports=3:1 calls_definitions=0:0
diff --git a/backend_old/src/edcmbone/canon/__init__.py b/backend_old/src/edcmbone/canon/__init__.py
index e46ed25..3e17d22 100644
--- a/backend_old/src/edcmbone/canon/__init__.py
+++ b/backend_old/src/edcmbone/canon/__init__.py
@@ -1,3 +1,5 @@
+# ratios: loc_comments=2:0 imports_exports=1:1 calls_definitions=0:0
 from .loader import CanonLoader
 
 __all__ = ["CanonLoader"]
+# ratios: loc_comments=2:0 imports_exports=1:1 calls_definitions=0:0
diff --git a/backend_old/src/edcmbone/canon/loader.py b/backend_old/src/edcmbone/canon/loader.py
index 866f473..2a2b075 100644
--- a/backend_old/src/edcmbone/canon/loader.py
+++ b/backend_old/src/edcmbone/canon/loader.py
@@ -1,3 +1,4 @@
+# ratios: loc_comments=80:79 imports_exports=3:1 calls_definitions=40:15
 """
 edcmbone.canon.loader
 ~~~~~~~~~~~~~~~~~~~~~
@@ -194,3 +195,4 @@ def meta(self, dataset):
                 dataset, list(mapping.keys())
             ))
         return mapping[dataset].get("_meta", {})
+# ratios: loc_comments=80:79 imports_exports=3:1 calls_definitions=40:15
diff --git a/backend_old/src/edcmbone/compress.py b/backend_old/src/edcmbone/compress.py
index ae77e64..b35148d 100644
--- a/backend_old/src/edcmbone/compress.py
+++ b/backend_old/src/edcmbone/compress.py
@@ -1,3 +1,4 @@
+# ratios: loc_comments=168:115 imports_exports=9:5 calls_definitions=63:11
 """
 edcmbone.compress
 ~~~~~~~~~~~~~~~~~
@@ -348,3 +349,4 @@ def compression_stats(original_text, compressed_bytes, parsed):
         "bone_stream_huffman_bits": round(bone_huffman_bits, 1),
         "bone_stream_savings_pct": round(bone_savings, 2),
     }
+# ratios: loc_comments=168:115 imports_exports=9:5 calls_definitions=63:11
diff --git a/backend_old/src/edcmbone/metrics/__init__.py b/backend_old/src/edcmbone/metrics/__init__.py
index 97e838b..221cd90 100644
--- a/backend_old/src/edcmbone/metrics/__init__.py
+++ b/backend_old/src/edcmbone/metrics/__init__.py
@@ -1,3 +1,4 @@
+# ratios: loc_comments=34:6 imports_exports=6:1 calls_definitions=0:0
 from .compute import RoundMetrics, compute_round, compute_transcript, energy_step
 from .stats import (
     tokenize, ngrams, ttr, repetition_ratio, shannon_entropy,
@@ -39,3 +40,4 @@
     "AxisState", "MetricAxis", "MetricReadout", "ConstraintField", "FieldMotion",
     "canonical_axes", "field_motion_fixture", "FIELD_MOTION_FIXTURE_MATRIX",
 ]
+# ratios: loc_comments=34:6 imports_exports=6:1 calls_definitions=0:0
diff --git a/backend_old/src/edcmbone/metrics/compute.py b/backend_old/src/edcmbone/metrics/compute.py
index b5bedfd..aa8dce0 100644
--- a/backend_old/src/edcmbone/metrics/compute.py
+++ b/backend_old/src/edcmbone/metrics/compute.py
@@ -1,3 +1,4 @@
+# ratios: loc_comments=200:145 imports_exports=6:4 calls_definitions=89:20
 """
 edcmbone.metrics.compute
 ~~~~~~~~~~~~~~~~~~~~~~~~
@@ -423,4 +424,5 @@ def compute_transcript(parsed_transcript, canon=None, alpha=0.85, delta_max=0.3)
         prev_kappa = m.kappa
         prev_entropy = shannon_entropy(tokenize(" ".join(t.text for t in rnd.turns)))
 
-    return results
\ No newline at end of file
+    return results
+# ratios: loc_comments=200:145 imports_exports=6:4 calls_definitions=89:20
diff --git a/backend_old/src/edcmbone/metrics/matrix.py b/backend_old/src/edcmbone/metrics/matrix.py
index 1b63c23..1a177ee 100644
--- a/backend_old/src/edcmbone/metrics/matrix.py
+++ b/backend_old/src/edcmbone/metrics/matrix.py
@@ -1,3 +1,4 @@
+# ratios: loc_comments=118:125 imports_exports=4:2 calls_definitions=15:2
 """
 edcmbone.metrics.matrix
 ~~~~~~~~~~~~~~~~~~~~~~~
@@ -265,3 +266,4 @@ def diff(matrix_a: dict, matrix_b: dict) -> dict:
             if wa != wb:
                 changes[(metric, prim)] = (wa, wb)
     return changes
+# ratios: loc_comments=118:125 imports_exports=4:2 calls_definitions=15:2
diff --git a/backend_old/src/edcmbone/metrics/orthogonality.py b/backend_old/src/edcmbone/metrics/orthogonality.py
index e62f6f1..8419fa2 100644
--- a/backend_old/src/edcmbone/metrics/orthogonality.py
+++ b/backend_old/src/edcmbone/metrics/orthogonality.py
@@ -1,3 +1,4 @@
+# ratios: loc_comments=230:94 imports_exports=4:7 calls_definitions=44:25
 """EDCM / UCNS metric orthogonality primitives.
 
 Implements the v0.2 signed-axis model for metric identity and state transport,
@@ -388,3 +389,4 @@ def canonical_axes() -> Dict[str, MetricAxis]:
         "edcm.projection.TBF": MetricAxis("edcm.projection.TBF", "speaker-share fairness projection", "projection", primitive=False),
     }
     return axes
+# ratios: loc_comments=230:94 imports_exports=4:7 calls_definitions=44:25
diff --git a/backend_old/src/edcmbone/metrics/projection.py b/backend_old/src/edcmbone/metrics/projection.py
index 8ce35af..2e6f3aa 100644
--- a/backend_old/src/edcmbone/metrics/projection.py
+++ b/backend_old/src/edcmbone/metrics/projection.py
@@ -1,3 +1,4 @@
+# ratios: loc_comments=77:96 imports_exports=4:6 calls_definitions=28:10
 """
 edcmbone.metrics.projection
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -214,3 +215,4 @@ def project_transcript(parsed_transcript, layer1_metrics):
     for rnd, m in zip(parsed_transcript.rounds, layer1_metrics):
         results.append(project(m, rnd.turns))
     return results
+# ratios: loc_comments=77:96 imports_exports=4:6 calls_definitions=28:10
diff --git a/backend_old/src/edcmbone/metrics/risk.py b/backend_old/src/edcmbone/metrics/risk.py
index 1018614..fda259d 100644
--- a/backend_old/src/edcmbone/metrics/risk.py
+++ b/backend_old/src/edcmbone/metrics/risk.py
@@ -1,3 +1,4 @@
+# ratios: loc_comments=37:66 imports_exports=2:5 calls_definitions=25:5
 """
 edcmbone.metrics.risk
 ~~~~~~~~~~~~~~~~~~~~~
@@ -127,3 +128,4 @@ def loop_risk(tokens_a, tokens_b):
     rep_ngram = rep_ngram_density(tokens_b, n=3)
     cos = cosine_sim(tokens_a, tokens_b)
     return clamp(0.5 * rep_b + 0.3 * rep_ngram + 0.2 * cos)
+# ratios: loc_comments=37:66 imports_exports=2:5 calls_definitions=25:5
diff --git a/backend_old/src/edcmbone/metrics/stats.py b/backend_old/src/edcmbone/metrics/stats.py
index e195c12..46ee837 100644
--- a/backend_old/src/edcmbone/metrics/stats.py
+++ b/backend_old/src/edcmbone/metrics/stats.py
@@ -1,3 +1,4 @@
+# ratios: loc_comments=76:84 imports_exports=4:13 calls_definitions=46:14
 """
 edcmbone.metrics.stats
 ~~~~~~~~~~~~~~~~~~~~~~
@@ -206,3 +207,4 @@ def norm_per_100(x, tokens):
     if not tokens:
         return 0.0
     return float(x) * 100.0 / len(tokens)
+# ratios: loc_comments=76:84 imports_exports=4:13 calls_definitions=46:14
diff --git a/backend_old/src/edcmbone/parser/__init__.py b/backend_old/src/edcmbone/parser/__init__.py
index a3a4587..af57e27 100644
--- a/backend_old/src/edcmbone/parser/__init__.py
+++ b/backend_old/src/edcmbone/parser/__init__.py
@@ -1,3 +1,4 @@
+# ratios: loc_comments=9:0 imports_exports=1:1 calls_definitions=0:0
 from .turns_rounds import parse_transcript, ParsedTranscript, Turn, Round, BoneToken, FleshToken
 
 __all__ = [
@@ -8,3 +9,4 @@
     "BoneToken",
     "FleshToken",
 ]
+# ratios: loc_comments=9:0 imports_exports=1:1 calls_definitions=0:0
diff --git a/backend_old/src/edcmbone/parser/turns_rounds.py b/backend_old/src/edcmbone/parser/turns_rounds.py
index fde2f45..0c087a1 100644
--- a/backend_old/src/edcmbone/parser/turns_rounds.py
+++ b/backend_old/src/edcmbone/parser/turns_rounds.py
@@ -1,3 +1,4 @@
+# ratios: loc_comments=225:119 imports_exports=5:6 calls_definitions=82:26
 """
 edcmbone.parser.turns_rounds
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -427,3 +428,4 @@ def _ordered_unique(iterable):
             seen.add(item)
             result.append(item)
     return result
+# ratios: loc_comments=225:119 imports_exports=5:6 calls_definitions=82:26
diff --git a/backend_old/src/edcmbone/ucns/__init__.py b/backend_old/src/edcmbone/ucns/__init__.py
index ccff9d0..c64c819 100644
--- a/backend_old/src/edcmbone/ucns/__init__.py
+++ b/backend_old/src/edcmbone/ucns/__init__.py
@@ -1,3 +1,4 @@
+# ratios: loc_comments=8:1 imports_exports=1:1 calls_definitions=0:0
 # edcmbone.ucns — UCNS (Universal Cognitive Notation System) encoders
 from .closed_tokens import encode, class_of, feature_payload_of, DISPATCH, CLASS_NAMES
 
@@ -8,3 +9,4 @@
     "DISPATCH",
     "CLASS_NAMES",
 ]
+# ratios: loc_comments=8:1 imports_exports=1:1 calls_definitions=0:0
diff --git a/backend_old/src/edcmbone/ucns/closed_tokens.py b/backend_old/src/edcmbone/ucns/closed_tokens.py
index 4844849..4bc0c46 100644
--- a/backend_old/src/edcmbone/ucns/closed_tokens.py
+++ b/backend_old/src/edcmbone/ucns/closed_tokens.py
@@ -1,3 +1,4 @@
+# ratios: loc_comments=351:140 imports_exports=6:3 calls_definitions=70:9
 """
 edcmbone — Closed-Token UCNS Encoder
 
@@ -572,3 +573,4 @@ def feature_payload_of(obj: UCNSObject) -> Optional[UCNSObject]:
     if len(obj.anchors_pos) != 2:
         return None
     return obj.anchors_pos[1].payload
+# ratios: loc_comments=351:140 imports_exports=6:3 calls_definitions=70:9
diff --git a/backend_old/src/edcmbone/ucns/ucns_v04.py b/backend_old/src/edcmbone/ucns/ucns_v04.py
index 1ee315a..49aeda9 100644
--- a/backend_old/src/edcmbone/ucns/ucns_v04.py
+++ b/backend_old/src/edcmbone/ucns/ucns_v04.py
@@ -1,3 +1,4 @@
+# ratios: loc_comments=118:70 imports_exports=5:6 calls_definitions=40:14
 """
 ucns_v04 — UCNS Engine (turn-fraction angle convention)
 ========================================================
@@ -226,3 +227,4 @@ def multiply(A: UCNSObject, B: UCNSObject) -> UCNSObject:
         anchors_pos=tuple(new_anchors),
         faces_pos=tuple(new_faces),
     )
+# ratios: loc_comments=118:70 imports_exports=5:6 calls_definitions=40:14
diff --git a/tests/conftest.py b/tests/conftest.py
index 3e04528..39d2d9b 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -4,10 +4,10 @@
 from pathlib import Path
 
 ROOT = Path(__file__).resolve().parents[1]
-BACKEND_SRC = ROOT / "backend" / "src"
+BACKEND_SRC = ROOT / "backend_old" / "src"
 
 # BACKEND_SRC must precede ROOT on sys.path: both contain an ``edcmbone``
-# package, but only backend/src/edcmbone carries CanonLoader + metrics. ROOT
+# package, but only backend_old/src/edcmbone carries CanonLoader + metrics. ROOT
 # stays on the path for the top-level test modules (core, engine, ucns_v04,
 # closed_tokens); the repo-root ``edcmbone`` package is only ever loaded by
 # tests under an explicit alias (see test_ucns_g_schema), never as ``edcmbone``.
diff --git a/tests/test_affix_residual_validation.py b/tests/test_affix_residual_validation.py
index 4ab77f8..0cb220f 100644
--- a/tests/test_affix_residual_validation.py
+++ b/tests/test_affix_residual_validation.py
@@ -2,7 +2,7 @@
 import sys
 
 ROOT = Path(__file__).resolve().parents[1]
-BACKEND_SRC = ROOT / "backend" / "src"
+BACKEND_SRC = ROOT / "backend_old" / "src"
 if str(BACKEND_SRC) not in sys.path:
     sys.path.insert(0, str(BACKEND_SRC))
 
diff --git a/tests/test_apostrophe_normalization_and_tokenization.py b/tests/test_apostrophe_normalization_and_tokenization.py
index e865278..62cb5dc 100644
--- a/tests/test_apostrophe_normalization_and_tokenization.py
+++ b/tests/test_apostrophe_normalization_and_tokenization.py
@@ -6,7 +6,7 @@
 
 def _parser_word_re():
     repo_root = Path(__file__).resolve().parents[1]
-    src_path = repo_root / "backend" / "src" / "edcmbone" / "parser" / "turns_rounds.py"
+    src_path = repo_root / "backend_old" / "src" / "edcmbone" / "parser" / "turns_rounds.py"
     src = src_path.read_text()
     m = re.search(r"_WORD_RE\s*=\s*re\.compile\(r\"([^\"]+)\"\)", src)
     assert m, "Could not locate _WORD_RE in parser/turns_rounds.py"
diff --git a/tests/test_metric_orthogonality_v02.py b/tests/test_metric_orthogonality_v02.py
index 6c9cab6..1df0be3 100644
--- a/tests/test_metric_orthogonality_v02.py
+++ b/tests/test_metric_orthogonality_v02.py
@@ -3,7 +3,7 @@
 from pathlib import Path
 
 ROOT = Path(__file__).resolve().parents[1]
-BACKEND_SRC = ROOT / "backend" / "src"
+BACKEND_SRC = ROOT / "backend_old" / "src"
 
 
 def _load_package(package_name: str, package_dir: Path):
diff --git a/tests/test_metrics_layer_designation.py b/tests/test_metrics_layer_designation.py
index 0e5ee20..89c7de7 100644
--- a/tests/test_metrics_layer_designation.py
+++ b/tests/test_metrics_layer_designation.py
@@ -3,7 +3,7 @@
 from pathlib import Path
 
 ROOT = Path(__file__).resolve().parents[1]
-BACKEND_SRC = ROOT / "backend" / "src"
+BACKEND_SRC = ROOT / "backend_old" / "src"
 
 
 def _load_package(package_name: str, package_dir: Path):
diff --git a/tests/test_polarity_balance.py b/tests/test_polarity_balance.py
index c82509c..44d8254 100644
--- a/tests/test_polarity_balance.py
+++ b/tests/test_polarity_balance.py
@@ -12,7 +12,7 @@
 from pathlib import Path
 
 REPO_ROOT = Path(__file__).resolve().parents[1]
-WORDS_PATH = REPO_ROOT / "backend" / "src" / "edcmbone" / "canon" / "data" / "bones_words_v1.json"
+WORDS_PATH = REPO_ROOT / "backend_old" / "src" / "edcmbone" / "canon" / "data" / "bones_words_v1.json"
 
 
 def _word_tokens():
diff --git a/tests/test_ucns_g_schema.py b/tests/test_ucns_g_schema.py
index 944436b..3702b0d 100644
--- a/tests/test_ucns_g_schema.py
+++ b/tests/test_ucns_g_schema.py
@@ -11,7 +11,7 @@
   * Grain order is token < turn < round < session < archive.
 
 These tests do not exercise the scalar EDCM metric vector in
-``backend/src/edcmbone/metrics/compute.py`` — UCNS-G is additive to the
+``backend_old/src/edcmbone/metrics/compute.py`` — UCNS-G is additive to the
 scalar layer, not a replacement.
 """
 
diff --git a/tests/test_ucns_objects.py b/tests/test_ucns_objects.py
index 74b0be4..62556c3 100644
--- a/tests/test_ucns_objects.py
+++ b/tests/test_ucns_objects.py
@@ -10,7 +10,7 @@
 from pathlib import Path
 
 ROOT = Path(__file__).resolve().parents[1]
-BACKEND_SRC = ROOT / "backend" / "src"
+BACKEND_SRC = ROOT / "backend_old" / "src"
 
 
 def _load_package(package_name: str, package_dir: Path):