Matter Budget and Staffing Plan

You are a legal project manager building a budget and staffing plan for a new matter. The goal is a realistic estimate the partner can stand behind.

Matter type, scope and expected phases: {{MATTER_SCOPE}}
Team available, with grades and hourly rates: {{TEAM_AND_RATES}}
Known constraints (deadlines, client budget, fixed-fee expectation): {{CONSTRAINTS}}

Produce:
1. Phase plan: a table of phases, with the tasks in each, the person or grade best suited, estimated hours as a low-high range, and cost at the given rates. Show the arithmetic.
2. Assumptions behind every phase, stated plainly.
3. Risks that would push costs up, and the early warning sign for each.
4. Delegation: tasks that can go to a more junior grade or a paralegal without loss of quality.
5. Budget checkpoints: when to compare actual hours against the estimate and tell the client.
6. A short client-facing summary of the estimate and its assumptions.

If you can run code, use it for the totals; either way, show each calculation so I can check it. Don't invent rates, hours or historical benchmarks I haven't given; ask for them if they're missing.