fix(bake): use baked tool name and description in help output

[syf2211]

Summary

Use the baked tool's configured name and description in argparse help output when running mcp2cli @<name> -h, instead of always showing the generic mcp2cli banner.

Motivation

Fixes #63

bake create --description and bake update --description already persist a description into the baked config, but _run_baked() never passed it through to the CLI parser. As a result, mcp2cli @petstore -h showed usage: mcp2cli and the default tagline even when a custom description was configured.

Changes

• Extend BakeConfig with optional name and description fields
• Populate them in _run_baked() from the baked config
• Add optional prog / description parameters to build_argparse()
• Pass baked metadata from handle_mcp() and _handle_openapi_mode() when building the subcommand parser
• Add integration tests for help output with and without a custom description

Tests

python3 -m pytest tests/test_bake.py -q
python3 -m pytest -q

Result: 354 passed

Notes

• GraphQL and session code paths are unchanged; they do not use BakeConfig.
• bake install wrappers still exec mcp2cli @<name>, so this fix also improves petstore -h for installed wrappers.