Attribute HITL plan-review requests to SWE-AF via sender manifest

[AbirAbbas]

Summary

SWE-AF created plan-review-v2 HITL requests through the hax Python SDK without passing a sender, so the hax-sdk hub rendered them as "Unknown sender".

This adds a sender manifest to the request kwargs in swe_af/app.py (where hax_create_kwargs is built), attributing the request to the agent node:

"sender": {
    "key": os.getenv("HAX_SENDER_KEY", os.getenv("HAX_SENDER_NAME") or NODE_ID),
    "display_name": os.getenv("HAX_SENDER_NAME") or NODE_ID,
},

• Defaults to the node's own identity (NODE_ID, default swe-planner).
• Env-overridable via HAX_SENDER_KEY and HAX_SENDER_NAME.
• The hax SDK normalizes a plain {key, display_name} dict into the wire SenderManifest, so a dict is sufficient.

Scope

Single file, minimal change: swe_af/app.py only.

Gates

make check (= pytest tests/ -x -q + compileall swe_af/) run locally on Python 3.12 (matching CI).

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