release: v0.8.0

[perber]

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[Copilot]

Pull request overview

This PR implements a major version upgrade to schema v2, introducing YAML frontmatter support for markdown files and migrating from Go's standard log package to structured logging with slog. The changes enable better metadata management and improve logging consistency across the application.

Key changes:

• Schema migration system enhanced to support incremental migrations with per-version schema file updates
• New frontmatter parsing and generation functionality with robust handling of edge cases
• Migration to structured logging using slog with configurable log levels

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
internal/core/tree/frontmatter.go	New file implementing YAML frontmatter parsing, splitting, and building functions with heuristic detection
internal/core/tree/frontmatter_test.go	Comprehensive test coverage for frontmatter functionality including edge cases
internal/core/tree/tree_service.go	Enhanced migration system, added v2 migration for frontmatter backfill, migrated to slog
internal/core/tree/tree_service_test.go	New migration tests and updated existing tests for frontmatter support, translated German comments
internal/core/tree/page_store.go	Updated CRUD operations to include frontmatter in all file operations, new ReadPageRaw method
internal/core/tree/page_store_test.go	Updated test expectations to account for frontmatter in created files
internal/core/tree/schema.go	Bumped CurrentSchemaVersion from 1 to 2
internal/core/tree/errors.go	Added ErrFrontmatterParse and ErrFileNotFound error types
cmd/leafwiki/main.go	Added structured logging setup with LOG_LEVEL environment variable support
go.mod	Added gopkg.in/yaml.v3 dependency for YAML parsing
go.sum	Updated with new yaml.v3 and transitive dependencies

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