chore: bump version to 3.0.2

[JeanExtreme002]

Why

#102 made the MCP server installable from the official MCP Registry: it added server.json, the README's mcp-name marker and the pymemoryeditor mcp subcommand that registry clients run. The registry checks that marker in the description PyPI shows, and clients install the version server.json pins. So publishing the listing waits on a PyPI release that contains both, and this patch is that release. It's a new subcommand but no library change, hence a patch.

What changed

• PyMemoryEditor/__init__.py: __version__ set to 3.0.2.
• docs/conf.py: the fallback release set to 3.0.2.
• server.json: the listing version, the package version and the --from pin set to 3.0.2. tests/mcp_server/test_registry.py requires all three to match __version__, and it passes. The file still validates against the registry schema.

After merging

1. Publish the GitHub release v3.0.2. publish.yml runs on release: published.
2. Once 3.0.2 is on PyPI, run mcp-publisher login github and then mcp-publisher publish.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.89%. Comparing base (40005dc) to head (4d61f72).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #103   +/-   ##
=======================================
  Coverage   89.89%   89.89%           
=======================================
  Files          41       41           
  Lines        3682     3682           
=======================================
  Hits         3310     3310           
  Misses        372      372           

Flag	Coverage Δ
Linux-py3.10	64.94% <100.00%> (ø)
Linux-py3.11	64.94% <100.00%> (ø)
Linux-py3.12	64.94% <100.00%> (ø)
Linux-py3.13	64.94% <100.00%> (ø)
Windows-py3.10	66.51% <100.00%> (+10.86%)	⬆️
Windows-py3.11	66.51% <100.00%> (ø)
Windows-py3.12	66.51% <100.00%> (ø)
Windows-py3.13	66.51% <100.00%> (ø)
macOS-py3.12	87.22% <100.00%> (ø)
mcp-Linux-py3.12	91.15% <ø> (ø)
mcp-Windows-py3.12	91.35% <ø> (ø)
mcp-macOS-py3.12	91.45% <ø> (ø)
speed-Linux-py3.12	66.54% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
PyMemoryEditor/__init__.py	96.66% <100.00%> (ø)

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