[v0.0.2] Implement GitHub API Client

[Kavirubc]

Create robust internal client to fetch issue metadata and interact with GitHub API. Milestone: 0.0.2v

[Kavirubc]

Architecture Decision: GitHub SDK vs CLI

We are implementing the GitHub integration using the official Go SDK () rather than wrapping the Work seamlessly with GitHub from the command line.

USAGE
gh [flags]

CORE COMMANDS
auth: Authenticate gh and git with GitHub
browse: Open repositories, issues, pull requests, and more in the browser
codespace: Connect to and manage codespaces
gist: Manage gists
issue: Manage issues
org: Manage organizations
pr: Manage pull requests
project: Work with GitHub Projects.
release: Manage releases
repo: Manage repositories

GITHUB ACTIONS COMMANDS
cache: Manage GitHub Actions caches
run: View details about workflow runs
workflow: View details about GitHub Actions workflows

ALIAS COMMANDS
co: Alias for "pr checkout"

ADDITIONAL COMMANDS
agent-task: Work with agent tasks (preview)
alias: Create command shortcuts
api: Make an authenticated GitHub API request
attestation: Work with artifact attestations
completion: Generate shell completion scripts
config: Manage configuration for gh
extension: Manage gh extensions
gpg-key: Manage GPG keys
label: Manage labels
preview: Execute previews for gh features
ruleset: View info about repo rulesets
search: Search for repositories, issues, and pull requests
secret: Manage GitHub secrets
ssh-key: Manage SSH keys
status: Print information about relevant issues, pull requests, and notifications across repositories
variable: Manage GitHub Actions variables

HELP TOPICS
accessibility: Learn about GitHub CLI's accessibility experiences
actions: Learn about working with GitHub Actions
environment: Environment variables that can be used with gh
exit-codes: Exit codes used by gh
formatting: Formatting options for JSON data exported from gh
mintty: Information about using gh with MinTTY
reference: A comprehensive reference of all gh commands

FLAGS
--help Show help for command
--version Show gh version

EXAMPLES
$ gh issue create
$ gh repo clone cli/cli
$ gh pr checkout 321

LEARN MORE
Use gh <command> <subcommand> --help for more information about a command.
Read the manual at https://cli.github.com/manual
Learn about exit codes using gh help exit-codes
Learn about accessibility experiences using gh help accessibility CLI.

Rationale:

1. Type Safety & Error Handling: The SDK provides strongly-typed Go structs and specific error types, which are far more reliable than parsing textual CLI output.
2. Deployment Simplicity: Using the SDK ensures our bot is a single, self-contained binary. Relying on Work seamlessly with GitHub from the command line.

USAGE
gh [flags]

CORE COMMANDS
auth: Authenticate gh and git with GitHub
browse: Open repositories, issues, pull requests, and more in the browser
codespace: Connect to and manage codespaces
gist: Manage gists
issue: Manage issues
org: Manage organizations
pr: Manage pull requests
project: Work with GitHub Projects.
release: Manage releases
repo: Manage repositories

GITHUB ACTIONS COMMANDS
cache: Manage GitHub Actions caches
run: View details about workflow runs
workflow: View details about GitHub Actions workflows

ALIAS COMMANDS
co: Alias for "pr checkout"

ADDITIONAL COMMANDS
agent-task: Work with agent tasks (preview)
alias: Create command shortcuts
api: Make an authenticated GitHub API request
attestation: Work with artifact attestations
completion: Generate shell completion scripts
config: Manage configuration for gh
extension: Manage gh extensions
gpg-key: Manage GPG keys
label: Manage labels
preview: Execute previews for gh features
ruleset: View info about repo rulesets
search: Search for repositories, issues, and pull requests
secret: Manage GitHub secrets
ssh-key: Manage SSH keys
status: Print information about relevant issues, pull requests, and notifications across repositories
variable: Manage GitHub Actions variables

HELP TOPICS
accessibility: Learn about GitHub CLI's accessibility experiences
actions: Learn about working with GitHub Actions
environment: Environment variables that can be used with gh
exit-codes: Exit codes used by gh
formatting: Formatting options for JSON data exported from gh
mintty: Information about using gh with MinTTY
reference: A comprehensive reference of all gh commands

FLAGS
--help Show help for command
--version Show gh version

EXAMPLES
$ gh issue create
$ gh repo clone cli/cli
$ gh pr checkout 321

LEARN MORE
Use gh <command> <subcommand> --help for more information about a command.
Read the manual at https://cli.github.com/manual
Learn about exit codes using gh help exit-codes
Learn about accessibility experiences using gh help accessibility would require installing additional tools in the deployment environment.
3. Performance: Direct API calls avoid the overhead of spawning a new shell process for every action.

Proceeding with SDK implementation.