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>

session_memory/detect/__main__.py

@@ -16,13 +16,14 @@ import os
 from ..core.store import Store
 from ..ingest import _expand, load_config
 from .cluster import cluster
+from .quality import filter_real, quality_config
 from .signals import extract_signals
 
 
 def run_detect(config: dict, *, min_frequency: int = 2) -> list[dict]:
     store_cfg = config.get("store", {})
     store = Store(_expand(store_cfg["db_path"]), _expand(store_cfg["blob_dir"]))
-    digests = store.list_digests()
+    digests = filter_real(store.list_digests(), quality_config(config))
     signals = extract_signals(digests)
     patterns = [p.to_dict() for p in cluster(signals, min_frequency=min_frequency)]
     store.save_patterns(patterns)
@@ -56,7 +57,8 @@ def main(argv=None) -> int:
 
     config = load_config(args.config)
     store_cfg = config.get("store", {})
-    n = len(Store(_expand(store_cfg["db_path"]), _expand(store_cfg["blob_dir"])).list_digests())
+    all_digests = Store(_expand(store_cfg["db_path"]), _expand(store_cfg["blob_dir"])).list_digests()
+    n = len(filter_real(all_digests, quality_config(config)))
     patterns = run_detect(config, min_frequency=args.min_frequency)
 
     if args.json:

session_memory/detect/quality.py

@@ -0,0 +1,75 @@
+"""Session-quality filter (T01).
+
+The capture layer ingests *every* session it finds — including API health-checks,
+smoke-tests, and interrupted runs (e.g. ``llm-connect`` firing "Say hello in one
+word", or a transcript that is just ``[Request interrupted by user]``). These are
+not real coding work, but the outcome heuristic labels the short ones ``abandoned``
+and the clusterer then mints false-positive "problem" patterns from them.
+
+:func:`is_real_coding_session` gates those out so Detect signals/clusters form only
+over genuine coding sessions. It is intentionally conservative — a session counts
+as real if it shows substantive activity, and is dropped only on clear trivial
+markers. Thresholds come from ``[detect.quality]`` in ``config.toml``.
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Optional
+
+# Prompt prefixes/markers that indicate a non-coding or interrupted session.
+_TRIVIAL_PROMPTS = (
+    "say hello", "hello", "[request interrupted", "return only this json",
+    "ping", "ok", "<system-reminder>",
+)
+
+# Tool buckets that count as "substantive" coding activity.
+_SUBSTANTIVE_TOOLS = (
+    "Edit", "Write", "Read", "Bash", "search_replace", "write", "read_file",
+    "run_terminal_command", "grep", "Grep", "glob", "Glob", "NotebookEdit",
+)
+
+
+@dataclass
+class QualityConfig:
+    min_events: int = 20          # below this, not a real coding session
+    min_substantive: int = 3      # >= this many substantive tool calls required
+    min_prompt_len: int = 25      # first prompt shorter than this is suspect
+
+
+def quality_config(config: Optional[dict] = None) -> QualityConfig:
+    d = (config or {}).get("detect", {}).get("quality", {}) if config else {}
+    return QualityConfig(
+        min_events=d.get("min_events", 20),
+        min_substantive=d.get("min_substantive", 3),
+        min_prompt_len=d.get("min_prompt_len", 25),
+    )
+
+
+def _substantive_calls(digest: dict) -> int:
+    hist = digest.get("tool_histogram") or {}
+    return sum(n for t, n in hist.items() if t in _SUBSTANTIVE_TOOLS)
+
+
+def is_real_coding_session(digest: dict, config: Optional[QualityConfig] = None) -> bool:
+    cfg = config or QualityConfig()
+
+    if not digest.get("repo"):
+        return False
+    if digest.get("event_count", 0) < cfg.min_events:
+        return False
+    if _substantive_calls(digest) < cfg.min_substantive:
+        return False
+
+    prompt = (digest.get("first_prompt") or "").strip().lower()
+    if len(prompt) < cfg.min_prompt_len:
+        return False
+    if any(prompt.startswith(p) for p in _TRIVIAL_PROMPTS):
+        return False
+
+    return True
+
+
+def filter_real(digests: list[dict], config: Optional[QualityConfig] = None) -> list[dict]:
+    cfg = config or QualityConfig()
+    return [d for d in digests if is_real_coding_session(d, cfg)]