feat: add star CTAs to README and job summaries

- Add prominent 'Star this repo' call-to-action at the top of README
- Inject star/brand CTA into every job summary and PR comment footer
- Target: convert 125+ Used-by users into stargazers

Author: shenxianpeng

README.md

@@ -6,6 +6,10 @@
 [![GitHub marketplace](https://img.shields.io/badge/Marketplace-commit--check--action-blue)](https://github.com/marketplace/actions/commit-check-action)
 [![slsa-badge](https://slsa.dev/images/gh-badge-level3.svg?color=blue)](https://github.com/commit-check/commit-check-action/blob/a2873ca0482dd505c93fb51861c953e82fd0a186/action.yml#L59-L69)
 
+<p align="center">
+  ⭐&nbsp;<strong><a href="https://github.com/commit-check/commit-check-action">Star commit-check/commit-check-action</a>&nbsp;— it helps others find us!</strong>
+</p>
+
 A GitHub Action for checking commit message formatting, branch naming, committer name, email, commit signoff, and more.
 
 ## What's New in v2

main.py

@@ -9,6 +9,14 @@
 # Constants for message titles
 SUCCESS_TITLE = "# Commit-Check ✔️"
 FAILURE_TITLE = "# Commit-Check ❌"
+STAR_CTA = (
+    "\n---\n"
+    "<p align=\"center\">\n"
+    "  ⭐ <strong><a href=\"https://github.com/commit-check/commit-check-action\">"
+    "Star commit-check/commit-check-action</a>"
+    " &mdash; if this saved you time, help others find it!</strong>\n"
+    "</p>\n"
+)
 COMMIT_MESSAGE_DELIMITER = "\x00"
 COMMIT_SECTION_SEPARATOR = "\n---\n"
 
@@ -228,8 +236,8 @@ def read_result_file() -> str | None:
 def build_result_body(result_text: str | None) -> str:
     """Create the human-readable result body used in summaries and PR comments."""
     if result_text is None:
-        return SUCCESS_TITLE
-    return f"{FAILURE_TITLE}\n```\n{result_text}\n```"
+        return f"{SUCCESS_TITLE}\n{STAR_CTA}"
+    return f"{FAILURE_TITLE}\n```\n{result_text}\n```\n{STAR_CTA}"
 
 
 def add_job_summary() -> int: