docs(examples): add batch multi-query example 08 and synchronize documentation (ticket-057)

[MatthiasLew]

Adds examples/08-batch-multi-query with runnable fixtures and updates examples/README.md and root README.md for ticket-057.

[ifuri-validator-agent]

Deterministic Validator approval for exact head ce3894905a1c2ad4bf19e020ba8c148605ca51f6.

Ticket: ticket-057
Correlation ID: data2dsl-pr-52-ticket-057
Model: zai/glm-5.3
Reviewed diff chunks: 2
Advisory LLM verdict: APPROVE
Advisory summary: Reviewed all 2 diff chunk(s). Documentation-only chunk for ticket-057: new example 08 fixtures (queries and left/right observations), README/CHANGELOG/TODO sync. No code changes, no security concerns. Governance check passes. | Documentation and example fixture additions for ticket-057: new example 08 directory, examples index update, ticket metadata, and JSON observation fixtures. No code, workflow, or secret changes.
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-057-1079
TICKET ticket-057
HEAD_SHA ce3894905a1c2ad4bf19e020ba8c148605ca51f6
CORRELATION_ID data2dsl-pr-52-ticket-057
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"