v0.8.0

There are a lot of under the hood improvements, but the headlines here are:

• Added a --parent flag for tasks which allows task chaining. Very powerful
  when combined with a Claude Code skill that teaches Claude how to use TSK.
• Added automatic tsk-proxy container management so it'll shut down when not in use.
• tsk server start will now kill running containers when you use ctrl-c to exit.
• Migrated json task storage to sql and renamed task directories to be just their task ID.
• Added the ability to add a description to your task templates via yaml frontmatter.
  Run tsk template list to see task descriptions.
• Improved TUI output tables in tsk list and tsk template list commands.

Task chaining allows you to specify parent child relationships between tasks. TSK will
wait to schedule a child task until the parent completes and the child will start from
the branch that the parent created.

There are two breaking changes:

• The tsk proxy commands are removed in favor of automatic proxy container management.
• Migrating to SQL storage and simplifying task directory paths. These changes did not
  cause issues in my testing, however, this is a large change and there may be cases
  that are broken with tasks created before the migration.

Added

• implement graceful server shutdown with container cleanup
• skip cleaning parent tasks with active children
• track shell and run tasks in the database
• replace IPC-based server stop with SIGTERM via PID file
• remove IPC from add and list commands in favor of direct SQLite access
• simplify storage wrapper from Arc<Mutex<Box>> to Arc
• add busy_timeout PRAGMA to SQLite storage for safe concurrent access
• run network isolation tests conditionally in precommit
• add TSK_CONTAINER and TSK_TASK_ID env vars to task containers
• add color coding to status column in tsk list
• support multiple parent IDs in database schema
• remove JsonTaskStorage and clean up legacy JSON references
• add automatic migration from tasks.json to SQLite
• wire SqliteTaskStorage as default storage backend
• add rusqlite dependency and implement SqliteTaskStorage
• add bold+underline styling to table headers
• add frontmatter support to task templates
• add duration column to list and replace table borders with aligned columns
• add task dependency chaining with --parent flag

Other

• remove NotificationClient trait, use concrete type in AppContext
• remove TerminalOperations trait, use concrete type in AppContext
• move DockerBuildLockManager out of AppContext into DockerImageManager
• remove GitOperations trait, extract to free functions
• remove FileSystemOperations trait, extract to free functions
• add comments to justfile recipes and simplify CLAUDE.md dev commands
• [breaking] remove tsk proxy command
• [breaking] remove repo hash prefix from task directory paths
• add task chaining with --parent to README