session-memory: weekly retro entrypoint + hub publish (AGENTIC-WP-0010)

The analysis half of the weekly coding retrospection. retro/build.py: windowed
detect+measure -> top-3 improvement suggestions per repo (cross-flavor first,
recommendations pulled from the Pattern Catalog) + fleet snapshot. retro/publish.py:
publishes the report to the hub as the coding_retro read model (event_type=
coding_retro progress event) + local JSON/md, graceful degrade. retro entrypoint
with --window-days/--publish/--json. Live verify over real sessions surfaced
per-repo suggestions with catalog recommendations. 13 new tests; suite 152/152.

Consumed by activity-core ACTIVITY-WP-0008 (Weekly Coding Retrospection, Sat 19:00).

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

tests/test_retro_build.py

@@ -0,0 +1,86 @@
+"""Weekly retro report tests (AGENTIC-WP-0010 T01)."""
+
+import os
+import sys
+
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from session_memory.curate.catalog import Catalog  # noqa: E402
+from session_memory.curate.schema import Resolution, SolutionPattern  # noqa: E402
+from session_memory.retro.build import weekly_retro  # noqa: E402
+
+
+def _digest(uid, repo, ts, flavor="claude", retries=5):
+    return {
+        "session_uid": uid, "flavor": flavor, "repo": repo, "outcome": "fail",
+        "started_at": ts, "event_count": 40,
+        "first_prompt": "Fix the failing build and retry the suite",
+        "cost": {"input_tokens": 100, "output_tokens": 10},
+        "tool_histogram": {"Bash": 20, "Edit": 12, "Read": 8},
+        "markers": {"errors": 0, "retries": retries, "test_runs": 0},
+        "error_snippets": [],
+    }
+
+
+def test_window_excludes_old_sessions():
+    digs = [
+        _digest("claude:a", "r1", "2026-06-01T10:00:00Z"),
+        _digest("claude:b", "r1", "2026-06-02T10:00:00Z"),
+        _digest("claude:old", "r1", "2026-01-01T10:00:00Z"),   # outside window
+    ]
+    r = weekly_retro(digs, since="2026-05-30T00:00:00Z", until="2026-06-08T00:00:00Z")
+    assert r["n_sessions"] == 2
+    assert r["window"]["days"] == 7
+
+
+def test_retry_storm_becomes_suggestion():
+    digs = [_digest(f"claude:{i}", "r1", "2026-06-0{}T10:00:00Z".format(i + 1))
+            for i in range(2)]
+    r = weekly_retro(digs, since="2026-05-30T00:00:00Z", until="2026-06-08T00:00:00Z")
+    s = r["suggestions"]
+    assert s and s[0]["repo"] == "r1"
+    assert s[0]["signal_type"] == "retry_storm"
+    assert "Investigate" in s[0]["recommendation"]  # no catalog -> default
+
+
+def test_recommendation_from_catalog(tmp_path):
+    cat = Catalog(str(tmp_path / "catalog"))
+    key = "problem:retry_storm:retries"
+    cat.upsert(SolutionPattern(
+        id=SolutionPattern.make_id(key), name="Retry storm", version="1.0.0",
+        polarity="problem", problem="repeated retries",
+        resolutions=[Resolution(summary="Stop and diagnose before retrying")]))
+    digs = [_digest(f"claude:{i}", "r1", "2026-06-0{}T10:00:00Z".format(i + 1)) for i in range(2)]
+    r = weekly_retro(digs, catalog=cat, since="2026-05-30T00:00:00Z", until="2026-06-08T00:00:00Z")
+    assert r["suggestions"][0]["recommendation"] == "Stop and diagnose before retrying"
+
+
+def test_caps_three_per_repo():
+    # five distinct problem signals in one repo -> capped at 3
+    digs = []
+    for i in range(2):
+        d = _digest(f"claude:{i}", "r1", "2026-06-0{}T10:00:00Z".format(i + 1))
+        d["markers"] = {"errors": 5, "retries": 5, "test_runs": 0, "human_interventions": 0}
+        d["tool_histogram"] = {"Bash": 120, "ToolSearch": 9,
+                               "mcp__state-hub__x": 30, "Edit": 5}
+        d["outcome"] = "abandoned"
+        digs.append(d)
+    r = weekly_retro(digs, since="2026-05-30T00:00:00Z", until="2026-06-08T00:00:00Z")
+    per_repo = [s for s in r["suggestions"] if s["repo"] == "r1"]
+    assert len(per_repo) <= 3
+
+
+def test_cross_flavor_ranks_first():
+    digs = [
+        _digest("claude:a", "r1", "2026-06-01T10:00:00Z", flavor="claude"),
+        _digest("grok:b", "r2", "2026-06-02T10:00:00Z", flavor="grok"),
+    ]
+    r = weekly_retro(digs, since="2026-05-30T00:00:00Z", until="2026-06-08T00:00:00Z")
+    assert r["suggestions"][0]["cross_flavor"] is True
+    assert r["suggestions"][0]["priority"] == "high"
+
+
+def test_includes_measure_snapshot():
+    digs = [_digest(f"claude:{i}", "r1", "2026-06-0{}T10:00:00Z".format(i + 1)) for i in range(2)]
+    r = weekly_retro(digs, since="2026-05-30T00:00:00Z", until="2026-06-08T00:00:00Z")
+    assert r["measure"]["n_sessions"] == 2