docs(rpa): mandate poll_until and raise kit min to 1.2.11 (v1.0.78)

Backport bounded readiness-wait convention and thin env/readiness error codes from platform-kit 1.2.11 into template docs, examples, and default platform_kit_min_version.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_platform_import.py

@@ -87,12 +87,12 @@ class TestPlatformImportSource(unittest.TestCase):
         from jiangchang_skill_core import version_ge
         from util.constants import PLATFORM_KIT_MIN_VERSION
 
-        self.assertEqual(PLATFORM_KIT_MIN_VERSION, "1.2.2")
+        self.assertEqual(PLATFORM_KIT_MIN_VERSION, "1.2.11")
 
         md_path = os.path.join(get_skill_root(), "SKILL.md")
         with open(md_path, encoding="utf-8") as f:
             md = f.read()
-        self.assertEqual(_parse_platform_kit_min_version(md), "1.2.2")
+        self.assertEqual(_parse_platform_kit_min_version(md), "1.2.11")
 
         req_path = os.path.join(get_skill_root(), "requirements.txt")
         with open(req_path, encoding="utf-8") as f: