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/render.py

@@ -624,6 +624,17 @@ def render_full(report: schema.Report) -> str:
         lines.extend(f"- {warning}" for warning in report.warnings)
         lines.append("")
 
+    # When this Report is a per-entity sub-run from vs-mode / --competitors,
+    # include the single-row Resolved Entities block so the saved file is
+    # self-describing. The artifact is populated by last30days.py's
+    # _competitor_runner and _main_runner closures.
+    resolved = report.artifacts.get("resolved")
+    if isinstance(resolved, dict) and resolved.get("entity"):
+        single_row = _render_resolved_entities_block([(resolved["entity"], report)])
+        if single_row:
+            lines.extend(single_row)
+            lines.append("")
+
     # ALL clusters (no limit)
     lines.append("## Ranked Evidence Clusters")
     lines.append("")