Replace a few more raw references with kj::Ptr in standard.c++

[jasnell]

No description provided.

[ask-bonk]

I've completed a thorough review of this PR. Let me summarize my analysis:

What the PR does: Replaces raw C++ references (Controller&, ReadableStreamJsController&) with kj::Ptr<T> in the streams standard.c++ file. This adds kj::PtrTarget as a base class to ReadableStreamJsController and converts several T& fields/parameters to kj::Ptr<T>.

Key findings:

1. Pattern consistency: This follows the exact same pattern already established by ReadableStreamInternalController which also uses public ReadableStreamController, public kj::PtrTarget (internal.h:41). The tryPipeLock(addPtrToThis()) pattern mirrors internal.c++:2483.

2. Safety improvement: The onConsumerWantsData pattern change from ReadableStreamJsController& owner = s.owner; to auto owner = s.owner; (copy of kj::Ptr) is a legitimate safety improvement. The old code saved a raw reference to s.owner before calling into callbacks that could destroy this. With kj::Ptr, debug builds will assert if the target is destroyed while the Ptr is still alive, making the invariant "owner outlives us" explicitly checkable.

3. PipeLocked::inner change: Changing from Controller& inner to kj::Ptr<Controller> inner is safe - the comment correctly documents that PipeLocked lives in the controller's own lock state machine, so the pointer is always valid.

4. ReadableState::owner change: The kj::Ptr<ReadableStreamJsController> owner field correctly represents the non-owning back-pointer to the controller. The kj::mv() calls on kj::Ptr parameters are idiomatic.

5. Multiple inheritance: No diamond problem - ReadableStreamController does not inherit from kj::PtrTarget.

6. No behavioral changes: This is purely a mechanical refactor of internal pointer representations. No API surface changes, no compat flag needed.

No actionable issues found.

LGTM

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