fix(master): allowlist public FE agent-challenge reads on proxy

[echobt]

Summary

• Allowlist public frontend agent-challenge GET surfaces on the master proxy so joinbase UI works with attested-route flags on or off.

Changes

• GET submissions list/detail/count/versions
• GET submissions/by-hash prefix (hash lookup)
• GET agents/{id}/evaluation|source|source/download
• Unit coverage in test_agent_challenge_attested_proxy.py

Test plan

• unit test_agent_challenge_attested_proxy passes
• joinbase agent list/detail still 200 via chain.joinbase.ai

Notes

• No secrets. No TEE claims. Companion to frontend public showcase ship.

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Run ID: af3a3fbf-5f10-4127-8744-42fcd3dfec17

📥 Commits

Reviewing files that changed from the base of the PR and between 81b7987 and f39d778.

📒 Files selected for processing (2)

• src/base/master/app_proxy.py
• tests/unit/test_agent_challenge_attested_proxy.py

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