DEPTH_SETTINGS = {
    "quick": {
        "per_stream_limit": 6,
        "pool_limit": 15,
        "rerank_limit": 12,
    },
    "default": {
        "per_stream_limit": 12,
        "pool_limit": 40,
        "rerank_limit": 40,
    },
    "deep": {
        "per_stream_limit": 20,
        "pool_limit": 60,
        "rerank_limit": 60,
    },
}

SOURCE_PRIORITY = {
    "factual": ["hackernews", "reddit", "x", "youtube"],
    "product": ["youtube", "reddit", "x", "tiktok"],
    "opinion": ["reddit", "x", "youtube", "hackernews"],
    "how_to": ["youtube", "reddit", "x", "hackernews"],
    "comparison": ["reddit", "x", "hackernews", "youtube"],
    "prediction": ["polymarket", "x", "hackernews"],
}

# Standard RRF smoothing constant (Cormack et al. 2009)
RRF_K = 60

def _candidate_sort_key(c):
    return (
        -c.rrf_score,
        -c.local_relevance,
        -c.freshness,
        c.title,
    )

def _entity_overlap(entities_a, entities_b):
    """Jaccard-style overlap on extracted entities."""
    if not entities_a or not entities_b:
        return 0.0
    intersection = entities_a & entities_b
    smaller = min(len(entities_a), len(entities_b))
    return len(intersection) / smaller

# Per-author cap: no single author/handle
# should dominate the pool.
_MAX_ITEMS_PER_AUTHOR = 3

def _extract_author(candidate):
    """Return a normalized author key."""
    for item in candidate.source_items:
        if item.author:
            return item.author.strip().lower()
    return None

BADGE (MANDATORY, FIRST LINE OF OUTPUT):
The Python engine now emits the badge
as the first line of its --emit=compact stdout.

Your correct behavior is to PASS THROUGH
the script output verbatim.

Badge format:
last30days v{VERSION} - synced {YYYY-MM-DD}

No other text on this line.
One blank line after, then synthesis begins.

PROSE_LABELS = [
    ("What I learned:", "What I learned"),
    ("KEY PATTERNS from the research:",
     "Key patterns from the research"),
]

EVIDENCE_BLOCK_PATTERN = re.compile(
    r"<!-- EVIDENCE FOR SYNTHESIS.*?-->"
    r"(.*?)<!-- END EVIDENCE -->",
    re.DOTALL
)