# 096 — Add single-character short flags to clap CLI args

## Summary

None of the CLI's clap-defined flags have a `short` form — every
option is long-only, including ones that are typed often
(`--file`, `--metrics-url`).

## Where

- `src/cli/mod.rs:20-39` — top-level `Args` struct, all fields
  `#[arg(long, ...)]` with no `short`:
  - `port: u16` — `:25-26`, `default_value_t = 0`
  - `settings_path: Option<PathBuf>` — `:28-29`
  - `file: Option<PathBuf>` — `:31-32`
  - `metrics_url: Option<String>` — `:34-35`
  - `name: Option<String>` — `:37-38`
- `src/cli/mod.rs:41-50` — `Command::Mcp` subcommand, also long-only:
  - `session: Option<String>` — `:44-45`
  - `port: Option<u16>` — `:46-47`

## Scope

- Add `short` to each flag where the initial letter is unambiguous
  within its own `Args`/subcommand struct: `-p` (port), `-f` (file),
  `-m` (metrics-url), `-n` (name), `-s` (settings-path or session,
  whichever reads more naturally per subcommand — they're in separate
  structs so both can use `-s` without conflict).
- `Mcp`'s `port` can reuse `-p` since it's a distinct struct from the
  top-level `Args`.
- Verify with `cargo run -- --help` (and the `mcp` subcommand's
  `--help`) that clap doesn't reject any of these for collision, and
  update `README.md`'s CLI usage section if it documents flags
  explicitly.