fix(rebase): migrate the replayed E2B branch onto the rebased parent

The linear replay carried old-lineage content over parent-owned files;
this checkpoint restores them and adapts the branch to the parent's
post-rebase seam:

- restore all pty/lsp/subprocess/code-runtime surfaces to the parent's
  exact content (this branch claims none of them) and drop the net-zero
  code-runtime-e2b/pty-e2b/lsp-e2b residue and its registrations
- widen serializeRemoteEnvironment to the seam's NodeJS.ProcessEnv
  tombstone contract: an explicit undefined removes an ambient entry
- migrate the two E2B fixture Agent stubs to the Inbox-model interface
  and Session.create
- re-apply the branch's gen-doc-graphs roles, THIRD_PARTY_NOTICES e2b
  row, and packages/README group row (trimmed to the doc budget);
  regenerate catalogs and re-record bilingual pairings

packages/code-runtime/code-runtime-worker/README.md

@@ -32,7 +32,7 @@ Every field is validated and defaulted; `maxOutputBytes` is a safe integer of at
 
 ## The worker entry, unbuilt and built
 
-Source mode loads erasable-only `src/worker.ts` through Node's native type stripping. Its transitive runtime closure contains only Node built-ins and relative source modules, so a fresh checkout never requires a sibling workspace package's unbuilt `lib/` export. The worker-local JSON snapshotter is parity-tested against the session-owned canonical boundary; both sides flatten and rebuild validated values around the message port so application nesting never reaches structured clone. Built mode passes the sibling `lib/worker.cjs` as a filesystem path because pkg's VFS Worker hook expects CommonJS; the same path works under ordinary Node. `tests/built-lib.e2e.ts` pins the real load path required by [docs/testing.md](../../../docs/testing.md).
+Source mode loads erasable-only `src/worker.ts` through Node's native type stripping. Its transitive runtime closure contains only Node built-ins and relative source modules, so a fresh checkout never requires a sibling workspace package's unbuilt `lib/` export. The worker-local and session-owned JSON boundaries both flatten and rebuild validated values around the message port so application nesting never reaches structured clone. Built mode passes the sibling `lib/worker.cjs` as a filesystem path because pkg's VFS Worker hook expects CommonJS; the same path works under ordinary Node. The repository-wide requirement to exercise this published entry path belongs to the [testing policy](../../../docs/testing.md).
 
 The SDK surface is the default/named `WorkerCodeRuntime` class plus `Config`. The operational `./worker` subpath exists only as the packaged spawn entry; the wire protocol and bootstrap helpers are source-private implementation details.
 
@@ -46,8 +46,8 @@ No direct invalidation; the named consumer owns any request-prefix changes.
 
 ## Known Limitations and Deferred Work
 
-- **OS processes a program spawns survive termination** — `worker.terminate()` ends the thread only; deployments requiring process-tree cleanup select `dsh-code-runtime-subprocess`, whose mounted subprocess provider owns that cleanup.
-- **Type-strip rides Node's experimental `stripTypeScriptTypes` API** — the relied-on behavior is pinned by unit tests, with amaro/sucrase as named drop-in replacements if it shifts.
+- **OS processes a program spawns survive termination** — `worker.terminate()` ends the thread only, weaker than bash-local's process-group kill; orphan cleanup is a deployment concern until a container backend exists.
+- **Type-strip rides Node's experimental `stripTypeScriptTypes` API** — amaro or sucrase are the named drop-in replacements if the relied-on behavior shifts.
 - **`computeMs` expiry can overshoot by up to one poll interval** — busy time is sampled every 25 ms (an internal constant, deliberately not config).
 - **Programs get a five-method `console` shim** (`log`/`info`/`warn`/`error`/`debug`) — deliberately not Node's full console surface.
 - **Intermediate binding values have no byte cap** — a program can exhaust process or worker memory with a value that never becomes outer output.