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feat(space): consolidate save/write_artifact/report_result into unified save_artifact tool (#1578)

Replaces four overlapping persistence tools with a single `save_artifact` tool
for both node agents and the Task Agent:

- **save_artifact**: unified upsert-or-append artifact store; replaces old
  `save` (ne.result), `write_artifact` (workflow_run_artifacts), and
  `report_result` (space_task_report_result) calls. Overwrite mode upserts
  on (nodeId, type, key); append mode auto-generates a unique key.
- **list_artifacts**: already existed on node agents; now also available on
  Task Agent via the new `artifactRepo` config field.
- **approve_task / submit_for_approval**: added to Task Agent tools for parity
  with end-node agents.
- **report_result removed** from both Task Agent and end-node handlers;
  `SpaceTaskReportResultRepository` dependency dropped from both.
- **list_peers** updated to read progress summaries from the artifacts table
  (progress-type artifact) instead of `ne.result`.

Built-in workflow prompts (CODING, RESEARCH, REVIEW_ONLY, PLAN_AND_DECOMPOSE)
and task-agent system prompt updated to reference `save_artifact` + new close
tools. All tests updated and passing (11 359 tests, 0 failures).

Fixes: artifact_key NOT NULL constraint — default to '' when key arg is absent.

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215 of 270 new or added lines in 8 files covered. (79.63%)

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