hitl: attribute HITL requests to PR-AF via sender manifest

[AbirAbbas]

Problem

PR-AF creates hax-sdk HITL review requests via the hax SDK's create_request, but never passed a sender. As a result the Response Hub displayed these requests as "Unknown sender" with no indication they originated from PR-AF.

Change

In src/pr_af/hitl/client.py (create_hax_form_request_with_timeout, where the create_request kwargs are built), add a sender manifest:

_sender_name = os.getenv("HAX_SENDER_NAME") or os.getenv("NODE_ID", "pr-af")
kwargs["sender"] = {
    "key": os.getenv("HAX_SENDER_KEY", _sender_name),
    "display_name": _sender_name,
}

• Defaults to the node's own identity (NODE_ID, falling back to "pr-af").
• Env-overridable via HAX_SENDER_NAME (display name) and HAX_SENDER_KEY (stable key).
• A plain dict is normalized to the wire SenderManifest by the hax SDK, so no extra import is required.

The hub will now attribute these requests to PR-AF instead of "Unknown sender".

Scope

One file, +7 lines. No behavior change beyond adding the sender field. import os was already present.

Gates

• ruff check src/ scripts/ (CI gate) — pass
• mypy src/pr_af/hitl/client.py — pass
• pytest — 69 passed

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