feat(mcp): target thread launches by project#8678

test(mcp): compose targeted launch fixtures

test(mcp): remove duplicate launch fixture import

fix(mcp): replay accepted root launches durably

fix(mcp): preserve inactive caller failure codes

docs(mcp): clarify targeted provider resolution

fix(mcp): make targeted thread retries durable

fix(mcp): revalidate delegated launch ownership

style(git): use tagged error handlers

fix(mcp): clarify launch admission failures

fix(mcp): preserve launch ceiling failure codes

fix(git): distinguish detached branch lookup

test(mcp): isolate branch mismatch rejection

fix(mcp): replay accepted branch-targeted launches

fix(mcp): revalidate launch branches at acceptance

fix(mcp): preserve launched run identity

fix(server): enforce fresh thread launch ceilings

fix(mcp): keep workspace strategy schema descriptions concrete

feat(mcp): target thread launches by project