feature: enable mac, windows agent

[tschaefer]

No description provided.

[Copilot]

Pull request overview

This pull request adds support for macOS and Windows agents to the Finch monitoring system. The changes enable the deployment and management of Grafana Alloy agents on macOS using launchd and add support for collecting Windows event logs.

Changes:

• Added "node" field to API messages to track agent platform type (unix/windows)
• Implemented macOS (darwin) support with launchd service management
• Added Windows event log collection via "event://" URL scheme
• Included PowerShell installer script for Windows Alloy installation

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
internal/api/api.proto	Added "node" field to RegisterAgentRequest and GetAgentResponse messages
internal/api/api.pb.go	Regenerated protobuf code with node field and comment cleanup
internal/agent/machine.go	Removed early return that blocked macOS support
internal/agent/deploy.go	Added launchd service deployment and macOS-specific binary path handling
internal/agent/teardown.go	Added launchd service teardown for macOS
internal/agent/update.go	Added macOS-specific binary path and service restart logic
internal/agent/register.go	Added node field to registration data
internal/agent/describe.go	Added support for event log sources and node field display
internal/agent/assets/com.github.tschaefer.finch.agent.plist	New launchd service configuration file for macOS
contrib/install-latest-alloy.ps1	New PowerShell script to install Alloy on Windows
cmd/agent/register.go	Added flags for event log collection and node type specification
cmd/agent/describe.go	Added display of node type and event log sources
cmd/completion/completion.go	Added shell completion for node type values
internal/service/assets/docker-compose.yaml.tmpl	Updated Finch container image tag
Makefile	Simplified proto generation command