feat: vs mode N full passes + --competitors auto-discovery + (/Last30Days) title (#312)

* feat: vs mode runs N full passes; --competitors wraps vs with auto-discovery

Unifies vs-mode and --competitors onto one fanout architecture. A topic
containing "vs" / "versus" now runs N full pipeline.run() calls in parallel
(reverting the one-pass latency optimization that removed per-entity
depth); --competitors becomes a SKILL.md-level shortcut where the hosting
reasoning model (Claude Code, Codex, Hermes, Gemini) discovers N peers via
its own WebSearch, runs Step 0.55 per entity, and invokes the engine with
a vs-topic + --competitors-plan JSON.

Changed:
- vs-mode: N full passes in parallel via fanout (was 1 merged pass).
- --competitors: SKILL.md shortcut for vs-mode-with-discovery. Engine flag
  kept for headless/cron use. LAW 7-style stderr reframed to lead with the
  hosting-model path (use WebSearch + --competitors-plan) instead of
  BRAVE_API_KEY. Footer BRAVE/SERPER nudge suppressed when --plan or
  --competitors-plan present (hosting model already has WebSearch).

Added:
- --competitors-plan JSON flag: per-entity {x_handle, x_related, subreddits,
  github_user, github_repos, context}. Accepts inline JSON or file path.
  subrun_kwargs_for helper is the single source of truth for per-entity
  kwargs — no closure-default fallthrough from main scope.
- Per-entity save files: each entity's sub-run produces its own
  {slug}-raw.md with a single-row Resolved Entities block.
- --polymarket-keywords filter for ambiguous single-token topics.

Fixed:
- test_competitor_subrun_isolation regression suite locks in 3.0.12's
  no-leak invariant (main flags do not inherit into peer sub-runs).
- Updates test_regression.py for the new comparison-mode payload shape.

Bumps plugin.json to 3.0.13. 1,219 tests passing.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix: comparison title attribution — (Last 30 Days) → (/Last30Days)

User feedback on 3.0.13 dogfood runs (Kanye vs Drake, Mercer Island,
Figma): the comparison-mode synthesis title should attribute to the
slash command rather than restate the date range.

Three SKILL.md occurrences updated. Pure documentation change. Bumps to
3.0.14.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Matt Van Horn <455140+mvanhorn@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/lib/pipeline.py

@@ -443,7 +443,7 @@ def run(
         if bundle.items_by_source.get(source):
             del bundle.errors_by_source[source]
 
-    items_by_source = _finalize_items_by_source(bundle.items_by_source, topic=topic)
+    items_by_source = _finalize_items_by_source(bundle.items_by_source, topic=topic, config=config)
     candidates = weighted_rrf(bundle.items_by_source_and_query, plan, pool_limit=settings["pool_limit"])
     ranked_candidates = rerank.rerank_candidates(
         topic=topic,
@@ -511,6 +511,7 @@ def _normalize_score_dedupe(
 def _finalize_items_by_source(
     items_by_source_raw: dict[str, list[schema.SourceItem]],
     topic: str = "",
+    config: dict | None = None,
 ) -> dict[str, list[schema.SourceItem]]:
     finalized = {}
     for source, items in items_by_source_raw.items():
@@ -523,6 +524,11 @@ def _finalize_items_by_source(
         # (e.g., WTI crude oil, Elon tweet counts) before footer emission.
         if source == "polymarket" and topic:
             items = polymarket.filter_items_against_topic(topic, items)
+            # --polymarket-keywords (via config): additional keyword filter
+            # for ambiguous single-token topics (e.g., "Warriors" → nba,gsw).
+            keywords = config.get("_polymarket_keywords") if isinstance(config, dict) else None
+            if keywords:
+                items = polymarket.filter_items_against_keywords(items, keywords)
         finalized[source] = items
     return finalized