Add module rules baseline plugin

[fornewid]

Port of fornewid/baseline-sample#4, trimmed to what Moop uses.

moop.module.rules, applied to the root project, records module structure rule violations in module-rules.txt, one sorted line each:

• hilt: <module>: Hilt applied outside :app and :impl modules.
• impl: <module> -> <impl module>: a module other than :app depends on an :impl module.
• layer: <module> -> <module>: a lower layer depends on a higher one (core < data < feature < app; modules outside the layers, such as :testing, are ignored).

./gradlew moduleRulesBaseline writes the file, and ./gradlew moduleRules fails with +/- lines and a re-baseline hint when it is out of date. moduleRules runs in CI and check.sh, and CHECK.md lists both commands.

Each module gets a moduleRulesViolations task that writes its own violations. The root tasks depend on these tasks by path, so every module is configured even with org.gradle.configureondemand=true.

Current baseline:

hilt: :core:kotlin
hilt: :feature:home:api
hilt: :testing
layer: :core:datetime -> :data:model

Left out compared to baseline-sample#4:

• the moduleRules { } extension (baseline file and layer order are fixed; the file is module-rules.txt instead of module-rules-baseline.txt)
• the ModuleInfo text format (each module writes its own violation lines instead)
• the separate check/baseline task classes, the Baseline helper and # comments in the baseline
• the root-only guard and the check lifecycle hook (the root project has no check task)
• matching the app by com.android.application, -impl suffixes and the second Hilt plugin id (Moop has :app, :impl modules and one Hilt id)
• the TestKit tests and the JUnit 5/Truth catalog entries (the unit tests use the existing JUnit 4 entry)

Verification

• ./gradlew -p build-logic :module-rules:test: 4 unit tests pass (CI doesn't run build-logic tests).
• ./gradlew -p build-logic :module-rules:validatePlugins passes with stricter validation enabled (cacheability and input normalization declared).
• ./gradlew moduleRulesBaseline writes the same 4 lines as the unmodified port of baseline-sample#4, whose 45 tests passed in Moop.
• ./gradlew moduleRules passes and reuses the configuration cache on the second run.
• ./gradlew :moduleRules (root only, configure-on-demand, no configuration cache) recomputes all 36 module outputs after they were deleted.
• Removing hilt: :testing from module-rules.txt fails with + hilt: :testing and the re-baseline hint.

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https://claude.ai/code/session_01Upxj1FvQeDpycupKdPQHUZ