# Phase 124: Method Specificity Contract - Context

**Gathered:** 2026-04-11
**Status:** Implemented and verified
**Mode:** First implementation phase for `v1.64`

<domain>
## Phase Boundary

Lock the bounded method-specificity contract for backlog `999.27` through
failing source-intake, topic-shell, runtime, schema, and acceptance tests.

</domain>

<decisions>
## Implementation Decisions

### Locked decisions

- do not reopen already-shipped assumption and reading-depth surfaces
- keep method-specificity inside existing L1/topic-shell/runtime boundaries
- close only a first production slice of `999.27`

</decisions>

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*Phase: 124-method-specificity-contract*
*Context captured on 2026-04-11 after Phase 124 implementation and verification*
