Report repository HEADs at execution time

[szgupta]

Description

Stack 2 of 2 on #13718.

Reports the materialized HEAD SHA and branch for each environment repository before setup commands run. The client sends the verified repository state through the harness-support API so the server can record the exact execution baseline for pinned and unpinned task-backed runs.

Linked Issue

N/A

Testing

• ./script/format

• cargo nextest run -p warp -E 'test(repository_baseline)' (2 passed)

• Presubmit clippy commands from script/presubmit

• I have manually tested my changes locally with ./script/run (not applicable to this headless agent setup path)

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

CHANGELOG-NONE

Conversation: https://staging.warp.dev/conversation/68b43c0f-5ef2-4aa8-b911-115291bdb7a2

Co-Authored-By: Warp agent@warp.dev

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@szgupta

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[oz-for-oss]

Overview

This PR adds client-side reporting of verified repository baselines by collecting each prepared repository's materialized HEAD and optional branch, sending those baselines through the harness-support API, and carrying the new reporting hook through driver setup and test harness support.

Concerns

• No blocking correctness, security, spec-drift, comment-style, or test-guideline concerns found in the attached diff.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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