v0.5.0

Install and first-run fixes. Everything in this release came from watching an
actual install fail.

Changed

• pip install llm-sidecar now installs everything. The base package was
  httpx alone, with the daemon, search and MCP behind extras — so the default
  install produced a command whose main subcommands died with a raw
  ModuleNotFoundError. The extras still exist as no-ops so old instructions
  keep working.

Added

• llm-sidecar service install — writes a launchd agent or systemd user unit
  so the daemon starts at login and restarts on failure. uninstall and
  status too.
• llm-sidecar config key <KEY> --save, config budget, config show,
  config clear-key. Setting a key previously needed the daemon running and a
  curl command.
• Python 3.14 in CI. pipx picked it by default on a real machine and nothing
  had ever tested it.

Fixed

• service install refuses when the executable sits in ~/Documents,
  ~/Desktop or ~/Downloads. macOS keeps those behind a privacy prompt that
  background services never receive, so the agent died at startup and
  KeepAlive restarted it forever. It now explains and points at pipx.
• The generated launchd plist sets ThrottleInterval, so a genuine crash is
  visible in the log rather than drowned by restarts.
• config key without --save exits non-zero and says why, instead of
  reporting success for something that vanishes when the process exits.

Install with: pipx install llm-sidecar