diff --git a/src/gps_denied/components/__init__.py b/src/gps_denied/components/__init__.py
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--- /dev/null
+++ b/src/gps_denied/components/__init__.py
@@ -0,0 +1,6 @@
+"""Hexagonal component packages (Phase 1, ARCH-01).
+
+Each subpackage hosts the Protocol surface for a swappable component.
+Concrete adapters land here in Plans 03-07; Phase 1 only defines the
+Protocols (Plan 01-02) so later migrations only update import paths.
+"""
diff --git a/src/gps_denied/components/anchor_verifier/__init__.py b/src/gps_denied/components/anchor_verifier/__init__.py
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diff --git a/src/gps_denied/components/coordinate_transforms/__init__.py b/src/gps_denied/components/coordinate_transforms/__init__.py
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diff --git a/src/gps_denied/components/flight_recorder/__init__.py b/src/gps_denied/components/flight_recorder/__init__.py
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diff --git a/src/gps_denied/components/gpr/__init__.py b/src/gps_denied/components/gpr/__init__.py
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diff --git a/src/gps_denied/components/mavlink_io/__init__.py b/src/gps_denied/components/mavlink_io/__init__.py
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diff --git a/src/gps_denied/components/safety_state/__init__.py b/src/gps_denied/components/safety_state/__init__.py
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diff --git a/src/gps_denied/components/satellite_matcher/__init__.py b/src/gps_denied/components/satellite_matcher/__init__.py
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diff --git a/src/gps_denied/components/vio/__init__.py b/src/gps_denied/components/vio/__init__.py
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