v0.5.0 - Parameters API Complete

Features

• merge params
• param_demo: add environment variable support
• params: add environment variable parameter support (RCL_PARAM_*)
• logging: merge logging improvements from feature/logging
• logging: add realtime logging support and fix log flush on exit

Bug Fixes

• tests: resolve absolute paths in launch file for ExecuteProcess

Documentation

• CHANGELOG: add unreleased section for params feature completion
• params: add comprehensive documentation and usage examples
• ROADMAP: mark parameters as complete with full parity
• logging: add comprehensive logging improvements summary
• tests: finalize test results and add production warnings

Tests

• params: add priority integration tests and fix YAML override behavior
• params: add comprehensive tests for CLI parameter overrides

Build

• gen: regenerate ROS 2 messages

Chores

• gitignore: ignore go.work files (managed at parent level)
• bump VERSION to 0.5.0 for v0.5.0
• repo: housekeeping cleanup for v0.5.0 release
• add commit message template and ignore local AI context
• Merge tag 'v0.4.1' into humble