ci(workflow): add common workflows for Android and Python, including CI /CD revamp

[wax911]

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[Copilot]

Pull Request Overview

This pull request consolidates and modernizes the CI/CD workflows for both Android and Python components of the project. It introduces reusable GitHub Actions, streamlines workflow organization, and establishes consistent patterns across the repository.

• Consolidated multiple individual Android workflows into a single comprehensive android-ci.yml workflow
• Replaced the existing Python workflow with new python-ci.yml and updated python-cd.yml workflows
• Added reusable composite actions for common setup tasks and centralized configuration files

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
AGENTS.md	Added comprehensive repository guidelines covering project structure, build commands, coding standards, and development workflows
.java-version	Added Java 21 version specification for consistent tooling
.github/workflows/python-ci.yml	New comprehensive Python CI workflow with dependency review, CodeQL analysis, linting, and testing
.github/workflows/python-cd.yml	Updated Python CD workflow to use the new reusable action and simplified token handling
.github/workflows/greeting.yml	Minor updates to workflow name and job naming
.github/workflows/gradle-wrapper-validation.yml	Removed standalone wrapper validation (now part of android-ci)
.github/workflows/gradle-dokka.yml	Removed standalone documentation generation (now part of android-ci)
.github/workflows/emoji-generator-ci.yml	Removed old Python workflow (replaced by python-ci)
.github/workflows/android-unit-test.yml	Removed standalone unit test workflow (now part of android-ci)
.github/workflows/android-spotless.yml	Removed standalone spotless workflow (now part of android-ci)
.github/workflows/android-publish-artifact.yml	Removed standalone artifact publishing (now part of android-ci)
.github/workflows/android-ci.yml	New consolidated Android CI workflow combining all previous Android workflows
.github/actions/python/action.yml	New reusable composite action for Python environment setup
.github/actions/android/action.yml	New reusable composite action for Android environment setup

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[github-actions]

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