cdprice02 / ferrish / #34

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refactor: introduce ShellConfig for centralized shell configuration (#57)

## Description

Closes #14.

Introduces `ShellConfig` in `src/ctx.rs` as the single source of truth
for configurable shell behavior (prompt, history path, max history
size). `ShellCtx` gains a `config: ShellConfig` field; the hardcoded
`"🦀> "` prompt in `shell.rs` is replaced with `self.ctx.config.prompt`.

`ShellBuilder` gains two new builder methods:
- `with_config(ShellConfig)` — replace the full config
- `with_prompt(String)` — override just the prompt string

`ShellConfig` is re-exported from `lib.rs` for downstream use.

## Type of change
- [x] Refactor

## Test checklist
- [x] `cargo test` passes
- [x] `cargo clippy --all-targets --all-features -- -D warnings` passes

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Co-authored-by: cdprice02 <cdprice02@gmail.com>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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