This PR adds test infrastructure and tests for tactic completion in
empty `by` blocks.
**Test runner improvements (`src/Lean/Server/Test/Runner.lean`):**
- Add `--⬑` marker variant that targets the column of `--` itself,
enabling column 0 tests (which `--^` cannot reach since `^` is always at
column 2+).
**New test file (`tests/server_interactive/completionEmptyBy.lean`):**
- Tests tactic completion in empty `by` blocks for both top-level `by`
and nested `by` (inside `id <| have := by`).
- Tests at various column positions on the line below `by`: indented
past `by`, at column 2, and at column 0.
- Tests on the `by` token itself (no completions expected).
- All positions below `by` currently offer tactic completions.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
