build(deps): require qsv-client>=0.4.0

[jqnatividad]

Summary

Bumps qsv-client to >=0.4.0 (release notes). 0.4.0 requires qsv 25.0.0 — the same floor as DP+'s MINIMUM_QSV_VERSION — and runs qsv --capabilities before every client's first command, raising QsvVersionError for older binaries. DP+ uses none of the APIs 0.3.0/0.4.0 removed or changed (from_version_output, supports_json_errors, error_formats, cwd= + relative stdout_path).

• QSVCommand.version() catches QsvVersionError (now a QsvError subclass) before the generic handler, so a too-old qsv_bin — including qsv 24, which rejects --capabilities — still fails startup with DP+'s At least qsv version 25.0.0 required. … error instead of Cannot get qsv version info…. Stale docs about the --version fallback are updated.
• tests/test_ai_suggestions.py: the qsv_command fixture patched out check_version, so under 0.4.0 the capabilities probe ran inside each test's mocked run_sync (returning {}) and 11 describegpt tests failed with QsvError: … not a qsv --capabilities document. The fixture now primes capabilities at construction with a mocked --capabilities response.
• tests/test_qsv_command_client.py: new test for a qsv that answers Unknown flag: '--capabilities'.
• CHANGELOG: updated the Unreleased qsv-client entry.

Testing

• Integration CI against a live CKAN stack (run): CKAN + Postgres + Solr + Prefect, with qsv-client 0.4.0 and qsv 25.0.0 installed. QSVCommand's startup version check passed through --capabilities; all 7 sample files ingested end to end (7 passed, 0 failed, 0 skipped); the qsv contract regression tests passed (14/14).
• Unit tests touched by this PR (test_qsv_command_client.py, plus the describegpt tests in test_ai_suggestions.py; 24 total): CI doesn't run these, and I ran them locally against qsv-client 0.4.0 with ckan/config/utils/psycopg2 stubbed. All pass, including the failure paths (JSON error, plain-text error, empty stderr, exit 255) and the new too-old-qsv test. The old fixture fails 11 of the describegpt tests under 0.4.0.
• Not run: the full unit suite with real CKAN. The "qsv too old" rejection is covered only by the unit tests, not in CI.

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