* fix: Add SHA to get_file_contents while preserving MCP behavior (github#595)

Enhance get_file_contents to include SHA information without changing
the existing MCP server response format.

Changes:
- Add Contents API call to retrieve SHA before fetching raw content
- Include SHA in resourceURI (repo://owner/repo/sha/{SHA}/contents/path)
- Add SHA to success messages
- Update tests to verify SHA inclusion
- Maintain original behavior: text files return raw text, binaries return base64

This preserves backward compatibility while providing SHA information
for better file versioning support.

Closes github#595

* fix: Improve error handling for Contents API response

Ensure response body is properly closed even when an error occurs by moving
the defer statement before the error check. This prevents potential resource
leaks when the Contents API returns an error with a non-nil response.

Changes:
- Move defer respContents.Body.Close() before error checking
- Rename errContents to err for consistency
- Add nil check for respContents before attempting to close body

This follows Go best practices for handling HTTP responses and prevents
potential goroutine/memory leaks.

* revert changes to resource URI

* use GraphQL API to get file SHA

* refactor: mock GQL client instead of getFileSHA function to follow conventions

* lint

* revert GraphQL

---------

Co-authored-by: LuluBeatson <lulubeatson@github.com>

… governance info for the github server (github#695)

* Refactor README and add host installation guides, governance docs

- Reorganized README for clarity and navigation
- Added dedicated installation guides for Claude, Cursor, Windsurf, JetBrains, and more
- Clarified contribution guidelines and approval criteria
- Added policies and governance documentation

* Update README.md

* Update README with configuration section for remote GitHub MCP Server

* Update MCP access policy description in README

Removing coding agent from the policy note, as the GitHub server is unaffected by this policy

* Update configuration steps for GitHub Copilot in JetBrains IDEs...

...to reflect changes in accessing settings and configuring MCP.

* Update install-other-copilot-ides.md

* Update Eclipse MCP support version and configuration steps...

...for GitHub Copilot plugin in installation guide.

* Update docs/installation-guides/install-cursor.md

* Update docs/installation-guides/install-windsurf.md

* Apply suggestion from @tonytrg

* Apply suggestion from @tonytrg

* Apply suggestion from @tonytrg

* Apply suggestion from @tonytrg

* Apply suggestion from @tonytrg

* Apply suggestion from @tonytrg

* Apply suggestion from @tonytrg

---------

Co-authored-by: Tony Truong <tonytrg@github.com>

* shorten tool name

* update function name to match tool name

* adjust wording of descriptions