[milanb17]

Summary

Pack the browser engine's grammar parse tables and unpack each language the first time a file in it is diffed. Stacks on #1094; merge it first.

before: 126.6 MB engine = 14.2 MB code + 111.0 MB grammar tables
after:   25.2 MB engine = 14.3 MB code +   9.6 MB packed tables

• Native builds already packed the tables with zstd. The build script now does the same for wasm, finding each table in the object file's data segments and linking symbol table with wasmparser.
• In the browser, ruzstd (pure Rust) provides the ZSTD_decompress the unpacker calls.
• The gzipped download goes from 11.7 MB to 8.7 MB.

Evidence

• Old and new engines produced identical output for 57 of 57 inputs: 49 files from this repository, plus samples for the largest grammars it has no files in (F#, Julia, Verilog, LaTeX, Fortran, Objective-C, SQL, VHDL).
• iPhone 17 Pro simulator, vite v5.3.0...v5.4.0 (217 files), cold loads, three runs: peak 507–537 MB and settled 280–283 MB, down from 696–759 MB and 374–422 MB with the previous PR alone.
• diffr-grammars passes rustfmt and clippy for native and wasm32. The crate has no tests; the native path is unchanged.

Merge Danger

Door: two-way; revert the commit and rebuild the engine.

Blast Radius: the browser engine's grammars. A table that unpacked wrongly would break parsing for that language only; the comparison above found none. ZSTD_decompress now appears among the engine's exports in the generated bindings.