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/config.toml

@@ -31,6 +31,13 @@ enabled = true
 root    = "~/.grok/sessions"
 glob    = "*/*/chat_history.jsonl"
 
+# Detect phase (AGENTIC-WP-0005): quality filter — drop non-coding/trivial sessions
+# before signals form, so health-checks don't mint false-positive patterns.
+[detect.quality]
+min_events      = 20   # below this many events, not a real coding session
+min_substantive = 3    # require >= this many substantive (edit/read/shell) tool calls
+min_prompt_len  = 25   # first prompt shorter than this is treated as trivial
+
 # Curate phase (AGENTIC-WP-0004): catalog location + promotion evidence bar.
 [curate]
 catalog_dir    = "session_memory/catalog"               # files-first Pattern Catalog (committed)