session-memory: session-quality filter (WP-0005 T01)

detect/quality.py: is_real_coding_session drops health-checks / smoke-tests /
interrupted / trivially-short sessions (event floor, repo present, substantive
tool activity, non-trivial prompt). Wired into run_detect so signals only form
over real sessions — fixes the abandoned false-positive. [detect.quality] knobs;
existing detect/curate fixtures made realistic. 8 new tests; suite 80/80.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_detect_quality.py

@@ -0,0 +1,61 @@
+"""Session-quality filter tests (T01)."""
+
+import os
+import sys
+
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from session_memory.detect.quality import (  # noqa: E402
+    QualityConfig,
+    filter_real,
+    is_real_coding_session,
+    quality_config,
+)
+
+
+def _digest(repo="agentic-resources", events=60, prompt="Implement the curate entrypoint",
+            tools=None):
+    return {
+        "session_uid": "claude:x", "flavor": "claude", "repo": repo,
+        "event_count": events, "first_prompt": prompt,
+        "tool_histogram": tools if tools is not None else {"Bash": 20, "Edit": 15, "Read": 8},
+    }
+
+
+def test_real_session_passes():
+    assert is_real_coding_session(_digest()) is True
+
+
+def test_healthcheck_prompt_dropped():
+    assert is_real_coding_session(_digest(events=3, prompt="Say hello in one word.",
+                                          tools={})) is False
+
+
+def test_interrupted_dropped():
+    assert is_real_coding_session(_digest(events=1, prompt="[Request interrupted by user]",
+                                          tools={})) is False
+
+
+def test_too_short_dropped():
+    assert is_real_coding_session(_digest(events=5)) is False
+
+
+def test_no_repo_dropped():
+    assert is_real_coding_session(_digest(repo=None)) is False
+
+
+def test_no_substantive_tools_dropped():
+    # plenty of events but only plumbing calls -> not real coding
+    assert is_real_coding_session(
+        _digest(tools={"mcp__state-hub__update_task_status": 40})) is False
+
+
+def test_filter_real_keeps_only_real():
+    digs = [_digest(), _digest(events=3, prompt="hello", tools={}), _digest(repo=None)]
+    assert len(filter_real(digs)) == 1
+
+
+def test_quality_config_from_toml():
+    cfg = quality_config({"detect": {"quality": {"min_events": 50}}})
+    assert cfg.min_events == 50
+    assert cfg.min_substantive == 3  # default preserved