Improve Claude-related setup

[alexander-yevsyukov]

This PR adds agent skills and configures Claude agents per claude-code-setup recommendations.

[Copilot]

Pull request overview

Adds substantial AI-agent configuration for Claude Code (skills, slash commands, subagents, hooks) plus minor unrelated cleanups (typo in CoreJvmCompiler KDoc, Kotest 6.1.10 → 6.1.11, coding-guideline wording, README expansion). The .claude/ and .agents/skills/ trees define repo-specific workflows (version bumps, dependency updates/audits, doc reviews, Kotlin reviews, pre-PR gate, file moves, Java→Kotlin conversion), with shell hooks that protect version.gradle.kts and gate gh pr create on a /pre-pr sentinel.

Changes:

• New .claude/ configuration: permission allowlist, PreToolUse/PostToolUse hooks (protect-version-file.sh, pre-pr-gate.sh, sanitize-kotlin.sh), slash commands, and subagents.
• New .agents/skills/ documents (kotlin-review, review-docs, dependency-audit, dependency-update, pre-pr) plus TOC update and minor coding-guideline wording.
• Misc: README expansion documenting AI-agent files; Kotest 6.1.11 bump; KDoc typo fix in CoreJvmCompiler.

Reviewed changes

Copilot reviewed 28 out of 28 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
README.md	Expands the list of files propagated by pull, adds AI-agent configuration section.
buildSrc/src/main/kotlin/io/spine/dependency/local/CoreJvmCompiler.kt	Fixes KDoc typo ("used to in" → "used in").
buildSrc/build.gradle.kts	Bumps Kotest 6.1.10 → 6.1.11.
.claude/settings.json	Defines Bash permission allow/deny/ask lists and registers Pre/PostToolUse hooks.
.claude/scripts/sanitize-kotlin.sh	PostToolUse hook stripping trailing whitespace and collapsing blank lines in Kotlin/Java sources.
.claude/scripts/protect-version-file.sh	PreToolUse hook blocking direct edits to version.gradle.kts.
.claude/scripts/pre-pr-gate.sh	PreToolUse hook blocking gh pr create until /pre-pr writes a fresh sentinel.
.claude/commands/*.md	Slash commands that delegate to the matching .agents/skills/*/SKILL.md.
.claude/agents/*.md	Subagents (kotlin-review, review-docs, dependency-audit) wired to their skills.
.agents/skills/*/SKILL.md	Authoritative skill definitions for review/audit/update/pre-pr workflows.
.agents/skills/dependency-update/agents/openai.yaml	OpenAI agent display metadata for the dependency-update skill.
.agents/coding-guidelines.md	Sharper wording for the double-empty-line rule.
.agents/_TOC.md	Adds entries for the new skills.

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