fix(cli): render history records in table/csv output

[bplatz]

Stacked on #1377 (fix/cli-ledger-flag-1368) — base is that branch, not main. Review/merge #1377 first.

Summary

fluree history <entity> with the default (table) output rendered blank cells and ? placeholders instead of the history records, even though --format json returned correct data (#1367).

Root cause

History queries project a select list, so the engine returns each row as a positional JSON array:

• no predicate filter: [?p, ?v, ?t, ?op]
• --predicate filter: [?v, ?t, ?op]

The table and CSV formatters instead read each row as an object (row.get("?t"), row.get("?op"), …). On an array every lookup returns None, producing blank t/value cells, a ? op placeholder (the unwrap_or("?")), and a missing predicate column. --format json was unaffected because it prints the raw array verbatim. The gap slipped through because existing history tests only exercised --format json.

Fix

• Add a HistoryRow accessor that reads rows positionally by array length (4 → [p,v,t,op], 3 → [v,t,op]), still tolerating object-keyed rows defensively.
• Route both the table and CSV formatters through it.

Output after the fix

+---+----+-------------------------------------------------+-------------------------------------------+
| t | op | predicate                                       | value                                     |
+===========================================================================================...=======+
| 1 | +  | http://www.w3.org/1999/02/22-rdf-syntax-ns#type | ex:Article                                |
| 1 | +  | ex:author                                       | ex:alice                                  |
| 1 | +  | ex:content                                      | Step 1: Check the monitoring dashboard... |
| 1 | +  | ex:name                                         | Deployment Runbook                        |
| 2 | +  | ex:content                                      | ...verify all health checks pass...       |
| 2 | -  | ex:content                                      | Step 1: Check the monitoring dashboard... |
+---+----+-------------------------------------------------+-------------------------------------------+

Tests

• Unit tests on both formatters covering both array shapes, CSV output, the object-row fallback, and the empty case.
• Extended the history_shows_changes integration test to assert the default table renders populated cells (no ?), exercising the real local query path.
• cargo fmt + clippy --all-features --all-targets -D warnings clean.

Closes #1367