# v1.69 Milestone Audit

Status: passed

## Scope Closed

- Phase `143`: L0 Source Discovery Via DeepXiv MCP Integration

## Production Outcome

`v1.69` now closes the missing pre-registration discovery gap in `L0` through:

- `research/knowledge-hub/source-layer/scripts/discover_and_register.py`
- `research/knowledge-hub/source-layer/scripts/register_arxiv_source.py`
- `research/knowledge-hub/runtime/scripts/run_l0_source_discovery_acceptance.py`
- `research/knowledge-hub/tests/test_source_discovery_contracts.py`
- `research/knowledge-hub/tests/test_runtime_scripts.py`
- `research/knowledge-hub/L0_SOURCE_LAYER.md`
- `research/knowledge-hub/source-layer/README.md`
- `research/knowledge-hub/runtime/README.md`
- `research/knowledge-hub/runtime/AITP_TEST_RUNBOOK.md`

The milestone adds:

- one thin search -> evaluate -> register bridge before canonical Layer 0
  registration
- one durable discovery receipt family under
  `source-layer/topics/<topic_slug>/discoveries/`
- one explicit fallback chain that keeps search external to the `L0` core
  protocol
- one isolated acceptance lane that proves the route on a temp kernel root

## Verification Evidence

- source discovery contract slice:
  - `python -m pytest research/knowledge-hub/tests/test_source_discovery_contracts.py -q`
  - result: `3 passed`
- isolated acceptance:
  - `python research/knowledge-hub/runtime/scripts/run_l0_source_discovery_acceptance.py --json`
  - result: `success`
- runtime acceptance harness slice:
  - `python -m pytest research/knowledge-hub/tests/test_runtime_scripts.py -k l0_source_discovery_acceptance -q`
  - result: `1 passed, 28 deselected`

## Accepted Open Gaps

- broader non-arXiv discovery providers remain deferred
- large-scale literature triage remains outside this thin bridge
- the next bounded open gap moves forward into `L1` assumption and reading-
  depth closure rather than reopening discovery itself
