Implement absolute paths with a leading :: - #29571
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A path written with a leading `::` (e.g. `::c::item`) is now anchored at the root module of the current program or library instead of resolving relative to the current module, so sibling modules can share a common submodule. Explicit program locators (e.g. `dep.aleo::Item`) are now also root-anchored rather than prefixed with the current module, which fixes resolution of external items referenced from inside a module.
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The fmt validate job type-checks each target fixture as a standalone file, so the absolute-paths fixture carries its own program block and root-level items. Review fixes: absolute paths consult imported libraries exactly like root-module relative paths; `::group::GEN` no longer canonicalizes to the group generator intrinsic; a bare `::` in type position produces a parse error instead of a panic; the absolute-prefix recovery is shared between the expression and type grammars; new parser errors quote `::`. The tree-sitter grammar accepts a leading `::` on path expressions and types, with corpus and rowan-compat coverage. `Path::absolute` is skipped during serialization when false, keeping the large AST snapshot expectations unchanged.
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Paths written with a leading
::(e.g.::c::item) are anchored at the root module of the current program or library, so sibling modules can share a common submodule. Explicit program locators (e.g.dep.aleo::Item) are now also root-anchored instead of being prefixed with the current module, fixing resolution of external items referenced from inside a module.Closes #28772. Closes #29561.