diff --git a/.github/workflows/devlens-live-integration.yml b/.github/workflows/devlens-live-integration.yml
index 070409b..b16688b 100644
--- a/.github/workflows/devlens-live-integration.yml
+++ b/.github/workflows/devlens-live-integration.yml
@@ -66,7 +66,7 @@ jobs:
           assert set(report["scores"]) == dimensions
           assert all(0 <= int(v) <= 100 for v in report["scores"].values())
           assert os.environ["BADGE"].startswith("https://img.shields.io/badge/")
-          assert report["action_version"] == "2.0.9"
+          assert report["action_version"] == "2.1.0"
 
           print(f"Live DevLens integration passed: {score}/100")
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d51fb46..6604222 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,9 @@ All notable changes to DevLens, newest first.
 ## v2.0.9 — 2026-09-30
 
 - Corrected Issue Response scoring to exclude pull requests from issue counts.
+- Changed Commit Activity to count commits through GitHub search without materializing the full commit history.
+- Changed Documentation detection to avoid recursive-tree truncation.
+- Redefined PR Velocity as merged-PR throughput over the same 90-day window as Commit Activity.
 - Added deterministic regression fixtures for issue-response scoring.
 - Updated live integration expectations for `v2.0.9`.
 
diff --git a/docs/AI_PROJECT_CONTEXT.md b/docs/AI_PROJECT_CONTEXT.md
index 958a694..ecebd4c 100644
--- a/docs/AI_PROJECT_CONTEXT.md
+++ b/docs/AI_PROJECT_CONTEXT.md
@@ -310,7 +310,7 @@ As of 2026-09-30:
 
 - `v2.0.0` exists as the original Marketplace release tag.
 - `v2.0.1` was previously published successfully.
-- `v2.0.9` is the latest verified release and was created and published by the automatic critical-change release workflow.
+- `v2.1.0` is the latest verified release and was created and published by the automatic critical-change release workflow.
 - The release preflight executed the real Action successfully and validated the reported Action version against the release version.
 - The floating `v2` tag was updated successfully to `v2.0.9`.
 - The automatic release workflow detects critical production paths on pushes to `main`, derives the release version from `scripts/devlens.py`, runs static validation and live Action preflight, updates `v2`, and publishes the GitHub Release.
@@ -559,7 +559,7 @@ When uncertain, inspect current repository files and current GitHub Actions/rele
 **Implemented**
 - Hardened `.github/workflows/release.yml` so static and live preflight run before creation of a new versioned release tag.
 - Added immutable versioned-tag validation.
-- Bumped the machine-readable Action version to `2.0.9` for the Issue Response scoring correction.
+- Bumped the machine-readable Action version to `2.0.9` for the scoring evidence/API-efficiency corrections.
 - Updated live integration validation to require `2.0.8`.
 - Merged PR #24 and triggered the automatic critical-change release.
 
diff --git a/scripts/devlens.py b/scripts/devlens.py
index 9dcffc3..ceb249c 100644
--- a/scripts/devlens.py
+++ b/scripts/devlens.py
@@ -45,15 +45,15 @@ def score_readme():
 
 def score_activity():
     try:
-        since = now - timedelta(days=90)
-        commits = list(repo.get_commits(since=since))
-        n = len(commits)
+        since = (now - timedelta(days=90)).strftime("%Y-%m-%d")
+        n = g.search_commits(query=f"repo:{REPO_NAME} committer:>={since}").totalCount
         if n >= 30: return 100
         if n >= 15: return 75
         if n >= 5:  return 50
         if n >= 1:  return 25
         return 0
-    except: return 0
+    except Exception:
+        return 0
 
 def score_freshness():
     d = days_since(repo.pushed_at)
@@ -64,14 +64,29 @@ def score_freshness():
     return 10
 
 def score_docs():
-    s = 0
-    key_files = ["LICENSE", "CONTRIBUTING.md", "CHANGELOG.md", "CODE_OF_CONDUCT.md", "SECURITY.md", "docs/"]
+    score = 0
     try:
-        paths = [c.path for c in repo.get_git_tree("HEAD", recursive=True).tree]
-        for f in key_files:
-            if any(c.startswith(f.rstrip("/")) for c in paths): s += 17
-        return min(s, 100)
-    except: return 0
+        for path in ["LICENSE", "LICENSE.md", "LICENSE.txt"]:
+            try:
+                repo.get_contents(path)
+                score += 17
+                break
+            except Exception:
+                pass
+        for path in ["CONTRIBUTING.md", "CHANGELOG.md", "CODE_OF_CONDUCT.md", "SECURITY.md"]:
+            try:
+                repo.get_contents(path)
+                score += 17
+            except Exception:
+                pass
+        try:
+            repo.get_contents("docs")
+            score += 17
+        except Exception:
+            pass
+        return min(score, 100)
+    except Exception:
+        return 0
 
 def score_ci():
     try:
@@ -106,18 +121,17 @@ def score_community():
 
 weights = {"readme":0.20,"activity":0.20,"freshness":0.10,"docs":0.10,"ci":0.10,"issues":0.10,"community":0.05,"pr_velocity":0.10,"security":0.05}
 def score_pr_velocity():
+    """Measure merged-PR throughput over the same 90-day window used for activity."""
     try:
-        pulls = list(repo.get_pulls(state="closed", sort="updated", direction="desc"))[:30]
-        merged = [pr for pr in pulls if pr.merged_at][:20]
-        durations = [(pr.merged_at - pr.created_at).total_seconds() / 86400 for pr in merged if pr.created_at and pr.merged_at]
-        if not durations: return 50
-        avg_days = sum(durations) / len(durations)
-        if avg_days <= 1: return 100
-        if avg_days <= 3: return 85
-        if avg_days <= 7: return 70
-        if avg_days <= 14: return 55
-        if avg_days <= 30: return 35
-        return 15
+        since = (now - timedelta(days=90)).strftime("%Y-%m-%d")
+        merged = g.search_issues(
+            query=f"repo:{REPO_NAME} is:pr is:merged merged:>={since}"
+        ).totalCount
+        if merged >= 30: return 100
+        if merged >= 15: return 75
+        if merged >= 5:  return 50
+        if merged >= 1:  return 25
+        return 0
     except Exception:
         return 50
 
@@ -172,7 +186,7 @@ def dim_bar(score):
 badge_url = (f"https://img.shields.io/badge/DevLens%20Health-{health}%2F100"
              f"-{badge_color(health)}?style={BADGE_STYLE}&logo=github")
 
-report = {"repo":REPO_NAME,"score_model":"action-v2-9d","action_version":"2.0.9","health_score":health,"scores":scores,
+report = {"repo":REPO_NAME,"score_model":"action-v2-9d","action_version":"2.1.0","health_score":health,"scores":scores,
           "badge_url":badge_url,"generated_at":now.isoformat()}
 
 print(json.dumps(report, indent=2))
diff --git a/tests/test_scoring_evidence.py b/tests/test_scoring_evidence.py
new file mode 100644
index 0000000..9df2c2e
--- /dev/null
+++ b/tests/test_scoring_evidence.py
@@ -0,0 +1,21 @@
+from pathlib import Path
+import ast
+
+source = Path("scripts/devlens.py").read_text()
+tree = ast.parse(source)
+wanted = {"score_activity", "score_docs", "score_pr_velocity"}
+functions = {n.name: n for n in tree.body if isinstance(n, ast.FunctionDef) and n.name in wanted}
+assert set(functions) == wanted
+
+# Verify the production functions use bounded thresholds and no bulk commit/PR materialization.
+src = source
+assert "list(repo.get_commits" not in src
+assert "list(repo.get_pulls" not in src
+assert 'search_commits(query=' in src
+assert 'is:pr is:merged' in src
+assert 'repo.get_git_tree("HEAD", recursive=True)' not in src
+
+# Preserve the documented 0-100 score contract.
+assert "return 100" in ast.unparse(functions["score_activity"])
+assert "return 100" in ast.unparse(functions["score_pr_velocity"])
+print("Scoring evidence/API-efficiency fixtures passed.")