Improve CLI outputs for agentic use (incl. lower token consumption)

# Problem
There are a few issues with the current CLI when used by agents.

# Feature
- Stdin/pipe input support
→ Support reading input from stdin or --from-file to enable composable pipelines between tools.
- Add Help text with usage examples
→ Include an Examples section in --help output so agents can learn correct usage patterns.
- Add a --no-color flag, for lower token consumption
- Add a --quiet / --silent flag, for lower token consumption
- Add a --concise / --short flag, for lower token consumption

# Source
Audit performed with [cli-agent-lint](https://github.com/Camil-H/cli-agent-lint)

No files, tests, or command entry points are named. Start by locating the CLI command parsing, help output, and output-formatting entry points, then trace how command input is currently received. Done means stdin or --from-file works, --help includes examples, and the requested color, quiet, and concise options produce the intended lower-token output.

Written by the indexing model from the issue text.