fix(verify): propagate harness session past extra env prefixes

[solomonneas]

Root cause

The shell and Brigade process received both environment assignments. The second invocation hit verify result reuse because its command and tree matched case A. _write_reused_receipt built the cache-hit receipt without stamping BRIGADE_CLAUDE_SESSION; only _run_verify_commands stamped fresh receipts.

The fix moves the existing 16-hex stamping rule into _stamp_harness_session and calls it from both fresh and reused receipt writers.

Reproduction after the fix

Case A, fresh receipt:

{
  "run_id": "20260726-203955-work-verify-f16366",
  "reused_from": null,
  "harness_session": {
    "harness": "claude",
    "fingerprint": "0123456789abcdef"
  }
}

Case B, two outer environment prefixes and a reused receipt:

{
  "run_id": "20260726-203956-work-verify-0bc5b3",
  "reused_from": "20260726-203955-work-verify-f16366",
  "harness_session": {
    "harness": "claude",
    "fingerprint": "fedcba9876543210"
  }
}

The regression test invokes the real CLI through /bin/sh for both shapes. Existing behavior for environment assignments inside --command remains covered.

Verification

• Full gate: ./scripts/verify
• Brigade receipt: 20260726-203339-work-verify-d83604
• Status: completed
• Exit code: 0

Closes #541.

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