Add line limit parsing and output retrieval mechanism (#26)

* Add line limit parsing and output retrieval mechanism

- Add server-side output storage with unique IDs
- Modify execute_code to support line_limit parameter (default: 30)
- Modify install_packages to support line_limit parameter (default: 30)
- Implement read_output tool for paginated access to stored outputs
- Add warnings for unlimited output requests (-1 line_limit)
- Add comprehensive test suite for new functionality
- Store full outputs and provide truncated responses when needed
- Support line range retrieval (start/end parameters) in read_output

Resolves #24

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Co-authored-by: Ilan F. S. Theodoro <ilan-theodoro@users.noreply.github.com>

* fix(server): include exception summary in truncated stderr from execute_code

Append exception summary when output is truncated so tests detect the exception type. Verified via uv run pytest -v (189 passed). Minor formatting cleanups.

* chore(server): cap output storage and use ISO8601 UTC timestamps

Implements _MAX_OUTPUT_ITEMS (env NAPARI_MCP_MAX_OUTPUT_ITEMS) with oldest-eviction and switches stored output timestamps to timezone-aware ISO8601. Also fixes imports in tests to use init_viewer/close_viewer. All tests pass (uv run pytest). Addresses PR review comments.

* feat(server): normalize line_limit and add tests for 0 and < -1

_truncate_output now coerces invalid values to safe defaults and treats line_limit < -1 as unlimited (-1). Added tests for 0 and -2. All tests pass (191).

* fix(server): normalize start/end in read_output and avoid double newlines

Cast start/end to int with defaults and only insert a separator newline between stdout/stderr when needed. All tests passing (191).

---------

Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: Ilan F. S. Theodoro <ilan-theodoro@users.noreply.github.com>

Author: ilan-theodoro

.github/workflows/test.yml

@@ -213,7 +213,7 @@ jobs:
     - name: Install dependencies
       run: |
         uv sync --extra test
-      
+
     - name: Setup Qt libraries (Linux only)
       uses: tlambert03/setup-qt-libs@v1