chore: add Claude Code project knowledge and helper skills

.claude/skills/prepare-release/SKILL.md

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+---
+name: prepare-release
+description: Use when cutting a new release of this plugin — bumping the version, updating the changelog, and refreshing the README compatibility tables before opening the release PR. Triggers on "prepare a release", "cut X.Y.Z", "bump the version", "release prep".
+---
+
+# Prepare a release
+
+Stage the release changes on a branch and stop for human approval before
+committing/pushing. See `CLAUDE.md` for the version/tag facts.
+
+## Steps
+
+1. **Branch** off `master`: `chore/release-X.Y.Z` (or extend an existing
+   release-prep branch).
+
+2. **Bump the version** in `src/main/resources/VERSION` to `X.Y.Z` (repo-root
+   `VERSION` is a symlink to it). `release.yml` asserts this equals the git tag,
+   so it must match the tag you will push (no `v` prefix).
+
+3. **CHANGELOG.md** — rename the `## Unreleased` section to `## ver X.Y.Z`. List
+   user-facing changes and a `### Breaking Changes` subsection if any. Reference
+   PRs as `[#NNN](...)`. (Do not list dev-only tooling like Spotless bumps.)
+
+4. **README.md and README_JP.md (keep both in sync):**
+   - Version-compatibility table: set the right-hand column for newly
+     unsupported AGP rows to `\>=2.4.0,\<X.Y.0`; add Android Studio code names
+     for new AGP rows from the official AGP compatibility table
+     (https://developer.android.com/build/releases/about-agp).
+   - Update the Gradle-compatibility and Binary-compatibility (min JRE) tables
+     and the requirement note if the minimums changed.
+   - When editing the table, keep columns aligned (a small reformat script that
+     pads each column to its max width is the reliable way).
+
+5. **Verify**: run the relevant checks via the `verify-locally` skill.
+
+6. **Stop and confirm with the user** before committing. Then commit in logical
+   units (e.g. `chore: bump up version to X.Y.Z` for VERSION+CHANGELOG, separate
+   docs commit), open the PR, and watch CI.
+
+## After merge
+
+- Tag `X.Y.Z` exactly (matches `VERSION`); `release.yml` publishes on the tag.

.claude/skills/verify-locally/SKILL.md

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+---
+name: verify-locally
+description: Use when reproducing this plugin's CI checks locally before pushing — running its unit tests, Spotless, or the AGP/Gradle acceptance specs against the DeployGate mock server. Triggers on "verify locally", "run the tests like CI", "check before pushing", NetworkFailure/Connection reset in ApiClientSpec, or "'null' is not a valid Gradle version".
+---
+
+# Verify locally (CI-equivalent)
+
+Reproduce the `build-and-test.yml` jobs on your machine. See `CLAUDE.md` for the
+underlying facts and gotchas; this is the runnable procedure.
+
+## Steps
+
+1. **Run outside the command sandbox** — Gradle writes `~/.gradle` and hits the
+   network. Use a JDK 17 (the build baseline). `export JAVA_HOME=<jdk17>`.
+
+2. **Start the mock server** (required for `ApiClientSpec` and the upload specs;
+   without it they hit `https://deploygate.com` and fail with `NetworkFailure` /
+   `Connection reset`):
+   ```bash
+   docker run -d --name dg-mock -p 3000:3000 ghcr.io/deploygate/deploygate-mock-server:main
+   # Apple Silicon: add --platform linux/amd64. If the port is taken, use another and adjust the URL.
+   export TEST_SERVER_URL=http://localhost:3000
+   until curl -fsI "$TEST_SERVER_URL" >/dev/null 2>&1; do sleep 2; done
+   ```
+
+3. **Pick the job to mirror:**
+   | CI job | Command |
+   |---|---|
+   | `unit-test` | `./gradlew publishToMavenLocal test` |
+   | `lint` | `./gradlew spotlessApply` |
+   | `acceptance-test` | `./gradlew testUnrollAcceptanceTest` |
+   | `acceptance-test-runtime-env` (one row) | `TEST_AGP_VERSION=<agp> TEST_GRADLE_VERSION=<gradle> ./gradlew --no-daemon testPluginAcceptanceTest` |
+
+   Add `--tests "*SomeSpec*"` to narrow a run.
+
+4. **Clean up:** `docker rm -f dg-mock`.
+
+## Gotchas
+
+- **`--no-daemon` is mandatory when setting `TEST_GRADLE_VERSION`** — a reused
+  daemon caches the env from its first start, so GradleRunner reads a stale value
+  and throws `'null' is not a valid Gradle version string`.
+- ProjectBuilder unit specs fail with `Problems service is not initialized` on
+  Gradle 8.12/8.13 (gradle/gradle#31862) — the wrapper must avoid those.
+- To exercise a different build-Gradle without touching the committed wrapper,
+  download that distribution and run `gradle -p <projectDir> <task>` from it.

CLAUDE.md

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+# CLAUDE.md — gradle-deploygate-plugin
+
+Project-specific knowledge for working in this repo. Version numbers (minimum
+AGP/Gradle/JRE, wrapper version) live in `README.md` / `build.gradle` — treat
+those as the source of truth rather than duplicating them here.
+
+## Local verification (reproducing CI)
+
+Gradle commands need to write `~/.gradle` and reach the network, so run them
+**outside the command sandbox**. Use a JDK that satisfies the wrapper's Gradle
+version (the build/dev baseline is JDK 17).
+
+- **Mock server (required for HTTP specs).** `ApiClientSpec` and the upload
+  acceptance specs talk to `TEST_SERVER_URL`; without it they hit
+  `https://deploygate.com` and fail with `NetworkFailure` / `Connection reset`.
+  Start it and export the URL:
+  ```
+  docker run -d --name dg-mock -p 3000:3000 ghcr.io/deploygate/deploygate-mock-server:main
+  # Apple Silicon: add --platform linux/amd64
+  export TEST_SERVER_URL=http://localhost:3000
+  ```
+- **Unit tests:** `./gradlew test` (needs `TEST_SERVER_URL`). These are
+  `ProjectBuilder`-based and run on the wrapper's Gradle.
+- **Plugin acceptance vs a specific AGP/Gradle:**
+  ```
+  TEST_AGP_VERSION=8.0.0 TEST_GRADLE_VERSION=8.0 \
+    ./gradlew --no-daemon testPluginAcceptanceTest --tests "*ConfigurationCacheSpec*"
+  ```
+  **`--no-daemon` is mandatory** when setting `TEST_GRADLE_VERSION`: the Gradle
+  daemon caches env vars from its first start, so a reused daemon reads a stale
+  value and GradleRunner throws `'null' is not a valid Gradle version string`.
+- **Unroll acceptance:** `./gradlew testUnrollAcceptanceTest`.
+- **Format/lint:** `./gradlew spotlessApply`.
+
+## Build / version gotchas
+
+- **ProjectBuilder + Gradle 8.12/8.13** throws `Problems service is not
+  initialized` in the unit tests (gradle/gradle#31862); fixed in 8.14. Keep the
+  wrapper off 8.12/8.13.
+- **Spotless 8.x** requires Gradle 8.1+ and Java 17. It is applied only on
+  Gradle 8.1+ (guard in `build.gradle`) so the lowest acceptance-matrix Gradle
+  row still validates the stated minimum.
+- The **wrapper Gradle is the build toolchain**, intentionally separate from the
+  minimum Gradle that *users* of the plugin need.
+- CI's `.github/actions/setup-java` installs Java 11 for `sdkmanager`, then the
+  `java-version` input becomes the active JDK; build jobs pass `java-version: 17`.
+
+## Release
+
+- The version is in `src/main/resources/VERSION` (repo-root `VERSION` is a
+  symlink). Bump it in a `chore: bump up version to X.Y.Z` commit.
+- `.github/workflows/release.yml` asserts `VERSION` equals the pushed tag (no
+  `v` prefix) — tag exactly `X.Y.Z`.
+- Keep **both** `README.md` and `README_JP.md` in sync (compatibility tables,
+  notes). Android Studio code names come from the official AGP compatibility
+  table.
+- `CHANGELOG.md`: add a `## Unreleased` section only when there are entries;
+  rename it to `## ver X.Y.Z` at release time.
+
+## PR / review conventions
+
+- Reply to review comments — **including bots (devin, gemini, Copilot)** — in
+  the comment thread with an `@mention` of the author:
+  `gh api repos/{owner}/{repo}/pulls/{pr}/comments/{id}/replies -f body=...`
+  (not as a top-level PR comment).
+- Bot findings are suggestions to verify, not orders. Push back with evidence
+  when they are wrong for this codebase.