bootstrap: define CLI contract and JSON output for git mind bootstrap

[flyingrobots]

Summary

Define the CLI contract and JSON output shape for git mind bootstrap.

This is Slice A from the Hill 1 semantic bootstrap spec.

Sponsor User

A developer or coding agent entering an unfamiliar repository who needs a fast first-pass semantic map.

Scope

• command name and invocation shape
• default write behavior vs dry-run behavior
• human-readable summary output
• JSON output shape
• success / warning / failure behavior
• how bootstrap points users toward follow-up commands

Acceptance Criteria

• the command contract is explicit enough to implement without guessing
• machine-readable output shape is defined before implementation
• the contract supports provenance/confidence summary data

Related

• bootstrap: define first semantic bootstrap slice for unfamiliar repositories #303
• docs/design/h1-semantic-bootstrap.md