chore: switch the template repository to released memory-bank-cli and remove tools

[dapi]

Context

Part of #51. Execute only after memory-bank-cli v1.0.0 is released from https://github.com/dapi/memory-bank-cli.

Goal

Make this repository template-only and consume the released memory-bank-cli from its standalone repository.

Scope

• Add the template-source marker required by memory-bank-cli doctor --profile auto.
• Update adoption, usage, ownership, and development documentation to use memory-bank-cli.
• Update template CI to install a pinned memory-bank-cli v1.0.0 and run memory-bank-cli lint and memory-bank-cli doctor --profile template.
• Remove tools/, the nested Go module, old CLI release workflow, memory-bank-lint documentation, and every old command reference.

Acceptance criteria

• This repository has no Go module or CLI source.
• CI validates the template with a pinned released memory-bank-cli version.
• Documentation contains neither memory-bank as an executable name nor memory-bank-lint.
• The copied memory-bank/ payload remains generic and does not include source-repository-only metadata.