2.x gap: port remaining burn summary modes and filters

[willwashburn]

From the Rust 2.x gap catalog.

Current 2.x status:

• burn summary supports the default model table, --json, --since, --project, --session, --by-provider, and --no-archive parsing.

Missing from 1.x parity:

• --by-tool
• --by-subagent-type
• --by-relationship
• --subagent-tree
• --quality
• --agent
• --workflow
• --provider

Acceptance:

• Wire the missing modes and filters through the Rust SDK/CLI without duplicating query logic in presenters.
• Remove explicit stub/rejection paths for implemented flags.
• Add focused Rust tests and golden coverage for representative modes.
• Update README/CLI help if behavior changes.