Draft capability entry (reuse-surface REUSE-WP-0017-T04, cohort 2)

Honest first-pass maturity vector grounded in README/docs/tests present
in this repo; no invented evidence. Flagged for human review before
publish. See reuse-surface history/2026-07-06-coverage-classification.md.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

registry/capabilities/capability.communication.markitect-quarkdown-adapter.md

@@ -0,0 +1,121 @@
+---
+id: capability.communication.markitect-quarkdown-adapter
+name: Markitect Quarkdown Render Adapter
+summary: Concrete Quarkdown render/export adapter for Markitect, mapping Markitect profiles to Quarkdown
+  profiles and running controlled Quarkdown CLI execution plans without forking or reimplementing Quarkdown.
+owner: markitect-quarkdown
+status: draft
+domain: communication
+tags:
+- markitect
+- quarkdown
+- adapter
+maturity:
+  discovery:
+    current: D3
+    target: D4
+    confidence: medium
+    rationale: README documents a precise scope list (adapter descriptor/entry point, profile mapping,
+      controlled CLI execution plans, permission/runtime dependency mapping, generated-artifact validation
+      and checksums, open-reuse integration metadata) and an explicit non-goal (does not reimplement or
+      fork Quarkdown).
+  availability:
+    current: A1
+    target: A3
+    confidence: medium
+    rationale: Python package (`markitect-quarkdown`) satisfying the Markitect render adapter contract;
+      consumed by markitect-tool as a renderer plugin.
+external_evidence:
+  completeness:
+    level: C1
+    confidence: low
+    basis: scope_vs_intent_and_consumer_expectations
+    satisfied_expectations:
+    - render.quarkdown adapter descriptor and entry point
+    - Quarkdown CLI execution plans with permission/runtime dependency mapping
+    - generated artifact validation and checksums
+    broken_expectations: []
+    out_of_scope_expectations: []
+  reliability:
+    level: R0
+    confidence: low
+    basis: consumer_quality_signals
+    known_reliability_risks:
+    - tightly coupled to markitect-tool's render adapter contract version
+discovery:
+  intent: Let Markitect render/export documents via Quarkdown through a controlled, checksum-validated
+    adapter boundary, keeping Quarkdown-specific runtime assumptions out of markitect-tool itself.
+  includes:
+  - Quarkdown render/export adapter
+  - Markitect-to-Quarkdown profile mapping
+  - controlled CLI execution with permission mapping and artifact checksums
+  excludes:
+  - Quarkdown itself (not reimplemented or forked)
+  - source-format ingestion (see markitect-filter)
+  assumptions: []
+  use_cases: []
+  research_memos: []
+availability:
+  current_level: A1
+  target_level: A3
+  current_artifacts:
+  - Python package (`markitect-quarkdown`) registering the render adapter entry point
+  target_artifacts: []
+  consumption_modes:
+  - library import (plugin/entry-point)
+relations:
+  depends_on: []
+  supports: []
+  related_to: []
+evidence:
+  documentation:
+  - README.md
+  tests:
+  - tests/
+  consumer_feedback: []
+  bug_reports: []
+  incidents: []
+consumer_guidance:
+  recommended_for:
+  - markitect-tool consumers needing Quarkdown-based rendering/export
+  not_recommended_for:
+  - needs for source-format ingestion (see markitect-filter) or non-Quarkdown renderers
+  known_limitations:
+  - tightly coupled to markitect-tool's render adapter contract version
+promotion_history: []
+---
+
+# Markitect Quarkdown Render Adapter
+
+## Overview
+
+`markitect-quarkdown` is the concrete Quarkdown render/export adapter for Markitect: it owns profile mapping, controlled CLI execution, and artifact validation, while explicitly not reimplementing or forking Quarkdown itself.
+
+## Assessment notes
+
+### Discovery
+
+README documents a precise scope list (adapter descriptor/entry point, profile mapping, controlled CLI execution plans, permission/runtime dependency mapping, generated-artifact validation and checksums, open-reuse integration metadata) and an explicit non-goal (does not reimplement or fork Quarkdown).
+
+### Availability
+
+Python package (`markitect-quarkdown`) satisfying the Markitect render adapter contract; consumed by markitect-tool as a renderer plugin.
+
+### Completeness
+
+First-pass honest assessment from the REUSE-WP-0017 coverage campaign
+(reuse-surface). No external consumer feedback exists yet; levels reflect
+scope-vs-intent documentation quality, not internal code quality.
+
+### Reliability
+
+No production consumer telemetry exists yet; reliability level is
+intentionally conservative pending REUSE-WP-0019 reuse-telemetry evidence.
+
+## Promotion checklist
+
+- [x] ID follows `capability.<domain>.<name>` pattern
+- [x] Maturity enums match `specs/CapabilityMaturityStandard.md`
+- [x] `external_evidence` is populated separately from `maturity`
+- [ ] Relations reference valid capability IDs (none yet)
+- [x] Index entry added in `registry/indexes/capabilities.yaml`