Persists the merge commit SHA on WorktreeEntity for every successful
single-task and unit merge, and adds a TaskMergeService.RevertMergeAsync
+ revert_merge MCP tool that undoes a merged task's merge via
`git revert -m 1` (never reset/rewrite, since the target checkout is
shared). Rejects cleanly when there's no recorded SHA, the repo is
mid-merge/mid-revert, or the target has foreign uncommitted changes;
a conflicting revert aborts immediately. Also exposes the new
mergeCommit field via get_task_worktree.
Delete SqliteConnectionFactory, SchemaInitializer, and schema.sql.
Fix ValueConverter lambdas in entity configurations (no throw-expressions
in expression trees). Add IDesignTimeDbContextFactory for dotnet-ef tooling.
Generate InitialCreate migration with seed data for agent/manual tags.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
mika kuns