feat(batch): implement batch multi-query comparison engine and CLI (ticket-054)

[MatthiasLew]

Implements BatchMultiQueryComparator in src/data2dsl_batch.py and data2dsl batch CLI subcommand with full test coverage for ticket-054.

[ifuri-validator-agent]

Deterministic Validator approval for exact head dffcd5c4c12e63e4627fedb7a1043648ee2cb870.

Ticket: ticket-054
Correlation ID: data2dsl-pr-49-ticket-054
Model: zai/glm-5.3
Reviewed diff chunks: 3
Advisory LLM verdict: APPROVE
Advisory summary: Reviewed all 3 diff chunk(s). Chunk 1 of 3 contains governance/ticket documentation and the beginning of src/data2dsl_batch.py. Documentation (CHANGELOG, TODO, TICKETS index, ticket-054 files) is consistent with the described feature. The new module starts with a reasonable deterministic design (sha256 hashing, dataclasses, reuse of DeterministicComparator). No code quality or security issues visible in this chunk; implementation details continue in later chunks. | Chunk adds BatchMultiQueryComparator, a batch CLI subcommand, and tests. Code is deterministic, no dangerous operations, no secrets or workflow changes. Minor observations noted below. | Final chunk adds tests for batch comparator (clean, conflicts/missing) and CLI batch subcommand using tmp_path fixtures; test structure is sound and exercises both happy and failure paths.
Advisory findings: none
The LLM output above is advisory and was not used as the approval trust root.
Merge will be attempted after this approval when explicitly authorized.

Decision record (recomputable)

DECISION D-054-2354
TICKET ticket-054
HEAD_SHA dffcd5c4c12e63e4627fedb7a1043648ee2cb870
CORRELATION_ID data2dsl-pr-49-ticket-054
ACTOR agent:ifuri-validator-agent[bot]
APPLIED_RULE P-CORE-015
INPUT author_login = "MatthiasLew"
INPUT observed_checks = ["governance / remote lifecycle=PASS"]
INPUT required_checks = ["governance / remote lifecycle"]
INPUT required_checks_source = "protected registry + GitHub applied rules (env/request)"
INPUT reviewer_login = "ifuri-validator-agent[bot]"
VERDICT APPROVE AUTHORITY DETERMINISTIC
REJECTED REQUEST_CHANGES BECAUSE NO_UNSAFE_CHANGE_REASON_FOUND
ADVISORY llm_verdict = "APPROVE" MODEL "zai/glm-5.3"
ASSERT VERDICT_AUTHORITY != "ADVISORY"