Adds LspSigCache: per-file signature cache under <project>/.viperc-lsp-cache, keyed by content hash+size, invalidated on didChange/didSave; resolves from-import, module-attribute and wildcard calls without building the workspace index. Extends LspTypes with list/array/pointer structural checks, array/string initializer lengths and list-literal element checks; adds return-type consistency, augmented-assignment narrowing, constant folding for unary/binop and string/list subscripts. Diagnostics use a per-line occurrence bucket, a dedicated cache work pool and statement/expression budgets so large include files stay responsive. gate13 covers the new rules.
TermiNexus
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