fix(test): give session_transcript handler test a temp KB

[kurosawareiji7007-hub]

Summary

• test_handler_returns_degraded_when_absent called kb.session_transcript with no discoverable .vouch root, so _store() raised and CI failed (seen on py3.13).
• Point the handler at a temp KB via chdir, and empty Claude/Codex search roots so the degraded available: false path is what gets exercised.

Test plan

• pytest tests/test_session_transcript.py::test_handler_returns_degraded_when_absent
• CI green on this PR
• Re-check fix(sandbox): omit --user when os.getuid is unavailable #585 / fix(vault-sync): mirror post-approve WORKING/DRAFT artifacts (#583) #586 CI after this lands (or in parallel — same base failure)

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Reviewing files that changed from the base of the PR and between be43b22 and 7ee942c.

📒 Files selected for processing (2)

• CHANGELOG.md
• tests/test_session_transcript.py

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[kurosawareiji7007-hub]

Superseded: same test fix cherry-picked onto #585 and #586 so their CI can pass without waiting on a separate PR. Closing to stay under the open-PR spam threshold.