chore(jetbrains): migrate to stable IntelliJ Gradle plugin

[kirillk]

What

• Upgrade the JetBrains plugin to IntelliJ Platform Gradle Plugin 2.17.0 and remove the snapshot-only plugin resolution setup.
• Let the Gradle plugin handle split-mode port selection with kilo.splitModeServerPort=0, and wire :runIdeSplitMode with the same local CLI prep as backend runs.
• Replace the compound split-mode IDE run config with a direct :runIdeSplitMode Gradle config and refresh developer docs.

Why

This catches our JetBrains plugin development tooling up with the now-released IntelliJ Platform Gradle Plugin work from JetBrains/intellij-platform-gradle-plugin#2164. With 2.17.0 released, we can stop carrying the local random-port workaround and snapshot repository setup.

Notes

• The checked-in run configs pass --no-configuration-cache because the IntelliJ run-IDE tasks still hit a configuration-cache serialization issue in this setup.
• No changeset: this is development tooling only.

Validation

• ./gradlew tasks --all
• ./gradlew typecheck
• ./gradlew --no-configuration-cache runIdeSplitMode --dry-run -Pkilo.splitModeServerPort=0 -Pkilo.dev.storage.isolated=true
• bun turbo typecheck (pre-push)

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

The only change since the last review is a one-line documentation addition to packages/kilo-jetbrains/README.md explaining why the checked-in run configs pass --purge-old-log-directories — this resolves the previously open SUGGESTION on this PR.

Files Reviewed (1 file changed since last review)

• packages/kilo-jetbrains/README.md

Previous Review Summary (commit 1285e54)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit 1285e54)

Status: 1 Issue Found | Recommendation: Merge

Overview

Severity	Count
CRITICAL	0
WARNING	0
SUGGESTION	1

Issue Details (click to expand)

SUGGESTION

File	Line	Issue
packages/kilo-jetbrains/README.md	112	New --purge-old-log-directories flag added to all three run configs isn't explained anywhere

Files Reviewed (10 files)

• CONTRIBUTING.md
• packages/kilo-docs/pages/contributing/architecture/jetbrains-plugin.md
• packages/kilo-jetbrains/.run/Run IDE (Backend).run.xml
• packages/kilo-jetbrains/.run/Run IDE (Frontend).run.xml
• packages/kilo-jetbrains/.run/runIdeSplitMode.run.xml
• packages/kilo-jetbrains/AGENTS.md
• packages/kilo-jetbrains/README.md
• packages/kilo-jetbrains/build.gradle.kts
• packages/kilo-jetbrains/gradle/libs.versions.toml
• packages/kilo-jetbrains/settings.gradle.kts

The build.gradle.kts port-selection logic, split-mode task wiring (runIdeFrontend/runIdeSplitMode), and the removed snapshot-repo/resolution-strategy in settings.gradle.kts all look correct and consistent with the stable 2.17.0 plugin migration described in the PR body. Docs (README.md, AGENTS.md, CONTRIBUTING.md, jetbrains-plugin.md) and the three .run/*.xml configs are updated consistently with each other.

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_{Reviewed by claude-sonnet-5-20260630 · Input: 16 · Output: 2.9K · Cached: 357.7K}

_{Review guidance: REVIEW.md from base branch main}