feat: resolve all workspace inheritance in package-all tool

Replace the old path-to-version patching with full workspace inheritance
resolution.  Each member's Cargo.toml now has all `workspace = true`
references inlined from `[workspace.package]` and
`[workspace.dependencies]`,
and the root Cargo.toml is stripped of those workspace sections to
become a
pure virtual manifest.  Post-package extraction also adds a bare
`[workspace]` to each standalone crate so it remains a valid workspace
root.

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