fix: per-entity Step 0.55, LAW 7 sub-run quiet, default 2, canonical SKILL.md (#311)

Four fixes based on 2026-04-22 test-window feedback on v3.0.11 --competitors:

- Each competitor sub-run now runs Step 0.55 (X handle / subreddits /
  GitHub) via resolve.auto_resolve inside the fanout closure. Deep-copied
  config per entity prevents _auto_resolve_context leak across sub-runs.
  Resolved data stored on report.artifacts["resolved"] for the renderer.
- New internal_subrun keyword on planner.plan_query and pipeline.run
  suppresses the LAW 7 "No --plan passed" stderr for engine-internal
  fan-out only. Default path unchanged.
- Default --competitors count is now 2 (3-way total). --competitors=N
  still customizes; range 1..6.
- SKILL.md STEP 0 canonical-path self-check forces readers who loaded
  from marketplaces/ (auto-restored to origin/main, stale) to re-read
  from plugins/cache/last30days-skill/last30days/{VERSION}/SKILL.md.
  Two of three 2026-04-22 test windows hit this stale-path trap.
- New ## Resolved Entities block in render_comparison_multi shows
  per-entity handles/subs/github for debug visibility.

Bumps plugin.json to 3.0.12. 12 new tests; 1,175 total passing.

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

tests/test_cli_competitors.py

@@ -29,13 +29,19 @@ class CompetitorsCliTests(unittest.TestCase):
         self.assertEqual(count, 0)
         self.assertEqual(explicit, [])
 
-    def test_bare_flag_defaults_to_three(self):
+    def test_bare_flag_defaults_to_two(self):
         args = _parse("Kanye West", "--competitors")
         enabled, count, explicit = cli.resolve_competitors_args(args)
         self.assertTrue(enabled)
-        self.assertEqual(count, 3)
+        self.assertEqual(count, 2)
         self.assertEqual(explicit, [])
 
+    def test_explicit_three_still_supported(self):
+        args = _parse("OpenAI", "--competitors", "3")
+        enabled, count, _explicit = cli.resolve_competitors_args(args)
+        self.assertTrue(enabled)
+        self.assertEqual(count, 3)
+
     def test_explicit_count(self):
         args = _parse("OpenAI", "--competitors", "4")
         enabled, count, explicit = cli.resolve_competitors_args(args)