Move Gradle plugin from build-logic/ to repo root

[kirich1409]

Summary

• The published Gradle plugin (dev.androidbroadcast.featured) lived in build-logic/featured-gradle-plugin/ while a stale empty featured-gradle-plugin/ directory sat at the repo root — confusing layout from a partial earlier refactor.
• build-logic/ is the conventional location for internal convention plugins, not for a Maven-Central artifact. Standard OSS Gradle-plugin repos (Detekt, OkHttp, Ktlint, …) keep the published plugin in its own directory and reserve build-logic/ for build-internal logic.
• This PR consolidates the plugin into featured-gradle-plugin/ as an included build at the repo root and removes the now-redundant build-logic/ wrapper.

What changed

• git mv of all 78 plugin sources/tests/fixtures from build-logic/featured-gradle-plugin/ to featured-gradle-plugin/.
• Merged build-logic/settings.gradle.kts into featured-gradle-plugin/settings.gradle.kts (now a standalone included-build root: rootProject.name = "featured-gradle-plugin", no nested include(...)).
• Root settings.gradle.kts: includeBuild("build-logic") → includeBuild("featured-gradle-plugin").
• Root build.gradle.kts: gradle.includedBuild("build-logic").task(":featured-gradle-plugin:publishTo…") → gradle.includedBuild("featured-gradle-plugin").task(":publishTo…") for both publishToMavenCentral and publishToMavenLocal.
• Removed empty build-logic/.
• Rewrote root CLAUDE.md to reflect the new layout (and to actually document architecture/commands — prior content was minimal).

No functional change: the plugin is still consumed via includeBuild(...) for dogfooding on :sample:feature-*, the publication coordinates are unchanged, and no production sources were touched.

Test plan

• ./gradlew :featured-gradle-plugin:compileKotlin — green
• ./gradlew :featured-gradle-plugin:test — 266 tests green
• ./gradlew :core:assemble, :sample:android-app:assemble (and other key modules) — green
• ./gradlew spotlessCheck — green
• CI: full pipeline (incl. K/N iOS framework linking, which hit OOM locally on this machine — unrelated to the move)

🤖 Generated with Claude Code

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