[tequdev]

Summary

• Remove JS Hooks support: compile-js, js2qjsc-cli, init js, the js2qjsc and 2bytes modules, and the esbuild/pako/base64-js dependencies. The init command keeps its type argument (only c is valid) so another hook type can be added later.
• Compile C Hooks in-process with hooks-compiler@0.2.0 instead of the remote compile server. HOOKS_COMPILE_HOST and the --xrpl flag are gone; no network access is needed to build.
• Vendor hook/*.h from the xahaud release branch into the init c template at contracts/include (8 files, including ls_flags.h and tx_flags.h). They also serve as the default when --headers is omitted. Headers are keyed by basename as before, so #include "foo.h" finds headers/sub/foo.h.
• scripts/update-headers.mjs re-syncs those headers (yarn headers:update); yarn headers:check exits 1 on drift and runs in CI as the headers-up-to-date job.
• init now rejects an invalid type before creating the project directory.
• Move tests from jest to node:test run via tsx --test: hooks-compiler is ESM-only and ts-jest rewrites import() to require(), so jest cannot load it. tsconfig uses module/moduleResolution node16 so tsc keeps the dynamic import.
• Require Node >= 20.12 (hooks-compiler's requirement).
• debug and HOOKS_DEBUG_HOST are unchanged.

Behaviour changes

• Optimization: the server compiled with -O3; hooks-compiler uses -O2 followed by wasm-opt -Oz. Output for contracts-c/base.c is 197 bytes (server: 231 bytes) with identical imports and exports.
• Gas-type hooks (HookApiVersion 1, no _g import) are still rejected by hook-cleaner, the same as with the compile server.

Release note

src/init/c/package.json still pins @xahau/hooks-cli: ^2.1.0 and the package version is still 2.1.0. Because the published 2.x CLI requires HOOKS_COMPILE_HOST and the new template .env no longer sets it, this should ship as 3.0.0 with the template devDependency bumped to ^3.0.0 in the release commit.

Verification

• yarn build, yarn lint, yarn test:integration (14 tests, including real npm/yarn/pnpm installs of a generated project built against this branch's CLI).
• Built contracts-c/base.c, chooks-template index.c, and iou-reward-hook reward.c with both the previous buildbox header set and the release-branch set (byte-identical output): all pass guard_checker, export only hook, import only env.*, and have import/export sets identical to the compile server's output for the same sources.
• Deployed base.wasm and index.wasm to a standalone xahaud via the generated project's deploy script: base: Finished. and accept (return code 14 = __LINE__) with the expected HookState entry written.
• Invalid C produces exit 1 and <name>.log containing the clang diagnostics.