Initial commit: AS4/411 directory and discovery service for Sankofa Marketplace

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/protocols/ktt.md

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+# KTT Rail (Placeholder)
+
+## Status
+
+KTT is a **rail plugin slot** until sector-specific definition. The name is used in different sectors for different systems; this document reserves the slot and describes placeholder behavior.
+
+## Identifier Types
+
+- **ktt.id** — Generic KTT identifier; format: alphanumeric, optional `.` `_` `-`.
+- **ktt.participantId** — Same validation as ktt.id.
+
+Validation is in `@as4-411/core` (validation.ts). A valid `ktt.*` identifier can be stored and resolved to a RouteDirective like any other identifier once directory data exists.
+
+## Endpoints
+
+To be defined when the rail is specified. Use standard protocol values (https, mq, etc.) and a profile name indicating the KTT channel.
+
+## Trust and Directory Source
+
+- **Authoritative directory source(s):** TBD per sector.
+- **Trust constraints:** TBD. Prefer tenant scoping and explicit allow/deny.
+
+## Connector
+
+- **packages/connectors/ktt**: Placeholder adapter with `ingestFromFile` and `ingestFromApi` stubs. When the rail is defined, implement ingest that maps external participants/identifiers/endpoints into the core directory model.
+
+## Acceptance
+
+- A valid `ktt.*` identifier resolves to at least one RouteDirective when directory data is present.
+- Adapter supports ingest (file + API modes) as stubs; full implementation when KTT is clarified.