v0.2.4 — fix raw arg coercion

Fix: raw arg now accepts string-encoded booleans

get_source_file's raw field was added in v0.2.3 without the loose deserializer every other MCP arg uses, so clients sending "raw":"true" (string) failed to parse and could not fetch the original .docx. Now coerced like every other arg. Extends the stringified-primitives test.

Asset: kb.exe (Windows x64).