Address review of the in-place loader: the directory-subtree filter had two
regressions vs the old mirror.
- It only rewrote files under the entry's package root, so a `dist/`
entry importing `../../shared/helper.ts` (or a symlink-escaping sibling)
left that module's legacy `@(scope)/pi-*` / `@sinclair/typebox` imports
un-rewritten.
- `findExtensionRoot` walked up to the nearest package.json, which for an
ad-hoc extension under a project (e.g. `/repo/.omp/extensions/foo.ts`)
resolved to the project root — so the permanent onLoad hook would then
rewrite unrelated project/host source imported later.
Replace the directory filter with a precise scope: pre-walk the entry's
relative-import graph (static + dynamic `./`/`../` specifiers), collect each
module's realpath, and build the onLoad filter as an exact-path alternation
of just those modules. This matches exactly the set the old mirror tracked
(minus the copy): it covers `../src`/symlinked siblings and never touches
the host, other extensions, node_modules deps, or unrelated project files.
Adds a regression test that a non-imported sibling stays outside the rewrite
scope, and renames the ../src test to reflect graph-following.
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