uv tool install fails on invalid receipt

[zanieb]

An old receipt breaks the install, we should overwrite it or provide a better message:

❯ uv tool install ruff
warning: `uv tool install` is experimental and may change without warning
error: Failed to read `uv-receipt.toml` at /Users/zb/Library/Application Support/uv/tools/ruff/uv-receipt.toml
  Caused by: TOML parse error at line 1, column 1
  |
1 | [tool]
  | ^^^^^^
missing field `entrypoints`
❯ cat "/Users/zb/Library/Application Support/uv/tools/ruff/uv-receipt.toml"
[tool]
requirements = ["ruff"]