v0.1 wave 2C (step 8): email digest scheduler

- digest.py: DigestScheduler with daily 06:00 PT loop
- SmtpConfig env-driven (CRAFTING_SMTP_*)
- notify.on event filter respected per project
- GET /digests/{date} + POST /admin/digest/run-now (dry_run flag)
- migration 006: digest_runs (idempotency via UNIQUE(date, project_name))
- text + HTML email bodies; matches spec's worked example
- Server lifespan integration; gracefully disables if SMTP not configured
- tests/test_digest.py: 8 tests (aggregation / filter / smtp mock / idempotency / endpoint)

Patch-drafted line is a placeholder until wave 3 / step 9 ships.

Spec: memory/spec-crafting-table.md

crafting_table/db.py

@@ -112,6 +112,21 @@ MIGRATIONS: list[tuple[str, str]] = [
         CREATE INDEX IF NOT EXISTS idx_findings_fingerprint ON findings(fingerprint);
         """,
     ),
+    (
+        "006_digest_runs",
+        """
+        CREATE TABLE IF NOT EXISTS digest_runs (
+          id              INTEGER PRIMARY KEY AUTOINCREMENT,
+          date            TEXT NOT NULL,
+          project_name    TEXT NOT NULL,
+          sent_at         INTEGER NOT NULL,
+          recipient_count INTEGER NOT NULL,
+          job_count       INTEGER NOT NULL,
+          UNIQUE(date, project_name)
+        );
+        CREATE INDEX IF NOT EXISTS idx_digest_runs_date ON digest_runs(date);
+        """,
+    ),
 ]
 # fmt: on
 
@@ -489,6 +504,52 @@ class DB:
             ).fetchall()
         return [dict(r) for r in rows]
 
+    # ---------- digest runs --------------------------------------------------
+
+    def record_digest_run(
+        self,
+        *,
+        date: str,
+        project_name: str,
+        sent_at: int,
+        recipient_count: int,
+        job_count: int,
+    ) -> bool:
+        """Record an attempted/successful digest send. UNIQUE(date, project_name)
+        enforces idempotency — a second call for the same date+project is a
+        no-op (returns False)."""
+        with self._conn() as c:
+            cur = c.execute(
+                """
+                INSERT OR IGNORE INTO digest_runs
+                  (date, project_name, sent_at, recipient_count, job_count)
+                VALUES (?, ?, ?, ?, ?)
+                """,
+                (date, project_name, sent_at, recipient_count, job_count),
+            )
+            return cur.rowcount == 1
+
+    def digest_run_exists(self, date: str, project_name: str) -> bool:
+        with self._conn() as c:
+            row = c.execute(
+                "SELECT 1 FROM digest_runs WHERE date=? AND project_name=?",
+                (date, project_name),
+            ).fetchone()
+            return row is not None
+
+    def list_digest_runs(self, date: str | None = None) -> list[dict]:
+        with self._conn() as c:
+            if date is None:
+                rows = c.execute(
+                    "SELECT * FROM digest_runs ORDER BY date DESC, project_name"
+                ).fetchall()
+            else:
+                rows = c.execute(
+                    "SELECT * FROM digest_runs WHERE date=? ORDER BY project_name",
+                    (date,),
+                ).fetchall()
+        return [dict(r) for r in rows]
+
     # ---------- async wrappers ----------------------------------------------
 
     async def arun(self, fn, *args, **kwargs):