A header that lives in a registry component and is not on
_MANAGED_COMPONENT_INCLUDES dies at "No such file or directory": the
project template ships no idf_component.yml, so nothing fetches it. That
list covered five display/camera components, which left the pieces the
official Espressif board demos are actually made of unavailable —
verified by compiling a one-include probe for each against staging:
led_strip.h FAIL (the C3-LCDkit knob_panel's WS2812 driver)
iot_button.h FAIL (its BOOT/knob-press handling)
iot_knob.h FAIL (its EC11 quadrature decoder)
esp_lcd_touch_gt911 (the P4 devkit's panel) and esp_codec_dev (every
audio demo on the VoCat and the P4) are added on the same grounds.
Anyone pasting code from esp-dev-kits or esp-bsp hit this on the first
line. Detection is unchanged — the dependency is declared only when the
source actually includes the header.
Tests: ManagedComponentDetectionTests in test_espidf_pure_mode.py, incl.
negative cases (a user's own my_led_strip.h must not match).
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