Fix logging polluting stdout space for mcp (#8)

[gitmotion]

Pull Request Overview

This PR implements a logging abstraction to prevent log pollution of stdout space for MCP (Model Context Protocol) usage. All console logging has been replaced with a custom Logger class that outputs to stderr with prefixed tags to avoid interfering with MCP communication.

• Introduces a singleton Logger class that outputs to stderr instead of stdout
• Replaces all console.log/error calls with logger.info/warn/error methods
• Updates project documentation with contribution guidelines for logging usage

File	Description
src/utils/logger.ts	New singleton Logger class implementation with stderr output
src/index.ts	Replaces all console logging with Logger abstraction and code formatting improvements
package.json	Version bump from 1.3.4 to 1.3.5
build/utils/logger.js	Compiled JavaScript output of the Logger class
build/index.js	Compiled JavaScript output with logging changes
README.md	Updated documentation with contribution guidelines and logging requirements
.github/PULL_REQUEST_TEMPLATE.md	New PR template enforcing logging guidelines

Commit logs:

* bugfix: print/log to sys.stderr insted of sys.stdout (#6)

Printing/logging sys.stdout causes initialization problems:

2025-08-04T17:31:34.484+02:00 DEBUG 43668 --- [mcp-tests] [pool-2-thread-1] io.modelcontextprotocol.spec.McpSchema : Received JSON message: Topic 'MY_TOPIC' is marked as public. No authentication required.
2025-08-04T17:31:34.485+02:00 ERROR 43668 --- [mcp-tests] [pool-2-thread-1] i.m.c.transport.StdioClientTransport : Error processing inbound message for line: Topic 'MY_TOPIC' is marked as public. No authentication required.

com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'Topic': was expecting (JSON String, Number, Array, Object or token 'null', 'true' or 'false')
at [Source: REDACTED (StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION disabled); line: 1, column: 6]

• bugfix: print/log to sys.stderr insted of sys.stdout (bugfix: print/log to sys.stderr insted of sys.stdout #7)

Printing/logging sys.stdout causes initialization problems:

Error processing inbound message for line: Sending notification to http://server.example/TOPIC with Markdown formatting

• add logger class abstraction using console.error to prevent initialization issues

• update build files

• bump version and update readme and include github pull request template