# Phase 144: L1 Assumption Ledger And Reading Depth Surface - Context

**Gathered:** 2026-04-12
**Status:** Ready for execution

<domain>
## Phase Boundary

This phase owns the still-open operator-visible closure of source-backed
assumptions and reading depth inside `L1`.

The phase should:

- extend the existing `l1_source_intake` surface
- keep reading-depth limitations visible on the real status/runtime path
- make shallow/conflicting evidence explicit without broadening into a general
  `L1` redesign

</domain>

<decisions>
## Implementation Decisions

- **D-01:** Treat this as the second bounded `999.27` closure slice rather than
  as a new independent intake subsystem.
- **D-02:** Build on `assumption_rows`, reading-depth labels, and existing
  runtime renderers instead of inventing a parallel artifact family.
- **D-03:** Keep `method_specificity_rows` closed and extend the same operator
  surface around it.
- **D-04:** Add one isolated acceptance lane so this intake-honesty slice can
  close independently of broader `L1` maturity work.

</decisions>

<canonical_refs>
## Canonical References

- `.planning/REQUIREMENTS.md`
- `.planning/ROADMAP.md`
- `research/knowledge-hub/knowledge_hub/l1_source_intake_support.py`
- `research/knowledge-hub/knowledge_hub/runtime_read_path_support.py`
- `research/knowledge-hub/tests/test_l1_method_specificity_contracts.py`
- `.planning/phases/144-l1-assumption-ledger-and-reading-depth-surface/PHASE.md`

</canonical_refs>

<deferred>
## Deferred Ideas

- full `L1` contradiction-resolution workflow beyond bounded operator visibility
- broad document-understanding expansion beyond assumptions and reading depth
- larger graph/intake redesign that is not required for this closure slice

</deferred>

---

*Phase: 144-l1-assumption-ledger-and-reading-depth-surface*
*Context gathered: 2026-04-12*
