fix: prevent V8 turboshaft WASM Zone OOM during indexing (#298, #293) (#322)

Large multi-language indexes crashed with `Fatal process out of memory:
Zone` on Node 22/24 (including the bundled runtime) — V8's turboshaft
optimizing WASM compiler exhausts its per-compilation Zone arena while
compiling tree-sitter grammars on a background thread, even with tens of
GB free (the Zone is a V8-internal arena, not the JS heap).

Run node with V8 `--liftoff-only`, which keeps grammar compilation on the
Liftoff baseline and never reaches the optimizing tier. Delivered via the
bundled launcher + a one-shot CLI re-exec guard for all other launch
paths. Empirically only `--liftoff-only` stops it (`--no-wasm-tier-up` /
`--no-wasm-dynamic-tiering` do not), and it must be on node's command
line (setFlagsFromString / worker execArgv / NODE_OPTIONS all fail).

Reproduced the exact crash with the real indexer on Node 24.16 against a
2,880-file / 18-language repo and confirmed the fix eliminates it; full
suite + 7 new tests pass. Bumps to 0.9.4.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/bin/codegraph.ts

@@ -27,6 +27,7 @@ import { createShimmerProgress } from '../ui/shimmer-progress';
 import { getGlyphs } from '../ui/glyphs';
 
 import { buildNode25BlockBanner, buildNodeTooOldBanner, MIN_NODE_MAJOR } from './node-version-check';
+import { relaunchWithWasmRuntimeFlagsIfNeeded } from '../extraction/wasm-runtime-flags';
 
 // Lazy-load heavy modules (CodeGraph, runInstaller) to keep CLI startup fast.
 async function loadCodeGraph(): Promise<typeof import('../index')> {
@@ -75,6 +76,13 @@ if (nodeMajor < MIN_NODE_MAJOR) {
   // Override active — banner shown for visibility, continuing.
 }
 
+// Re-exec with V8's `--liftoff-only` if it isn't already set, so tree-sitter's
+// large WASM grammars never hit the turboshaft Zone OOM (`Fatal process out of
+// memory: Zone`) on Node >= 22. No-op under the bundled launcher, which already
+// passes the flag. Must run before any grammar (in the parse worker, which
+// inherits this process's flags) is compiled. See ../extraction/wasm-runtime-flags.
+relaunchWithWasmRuntimeFlagsIfNeeded(__filename);
+
 // Check if running with no arguments - run installer
 if (process.argv.length === 2) {
   import('../installer').then(({ runInstaller }) =>