0dbdc530ba
Reserved type-name spellings (s1, s2, u8, …) can now be used as value identifiers two ways, resolving issue 0089: 1. Backtick raw identifier: a leading backtick (`s2) lexes to an .identifier token carrying a new Token.is_raw flag, with the backtick excluded from the text. A raw identifier is never type-classified — the parser skips Type.fromName for it — so it is always a value identifier. The flag threads to VarDecl.is_raw / Param.is_raw at binding sites, and the reserved-type-name check (UnknownTypeChecker) skips raw bindings. Because the token tag stays .identifier, the escape works in every position (local, global, param, field, fn name, struct member, later reference) with no per-site parser change. 2. #import c exemption: c_import.zig synthesizes foreign decls with Param.is_raw = true, so generated C param names that collide with reserved type names (s1, s2) import unedited. A bare reserved-name binding in sx still errors (issue 0076 preserved): the is_raw-gated skip only fires for backtick / foreign names, and a raw binding's address-of / autoref lowering stays correct because every occurrence is an .identifier, never a .type_expr. Tests: examples/0151 (backtick, every position), examples/1220 (foreign exemption, compiled+run), lexer unit tests. 1119 (bare-binding rejection) stays green. specs.md + readme.md updated.
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