plugins: surface plugin name and Python exception on init failure

"plugin failed to initialize" with no name and no exception text is
the canonical first-line indicator for a Python plugin that didn't
register — but it tells the user nothing about *which* plugin or
*why*. Encountered while diagnosing a flaky first-launch failure
where a Python plugin's init() silently returned False on cold
boot and succeeded on the next run, plus a Ready or Not instance
that wouldn't open.

Wrap the IPlugin::init trampoline in pyplugins.h manually instead
of relying on PYBIND11_OVERRIDE_PURE so we can:
  - log the plugin's name and the surrounding hint when init()
    returns False (typically a plugin swallowing an exception in
    its own try/except);
  - catch pybind11::error_already_set and log the Python exception
    text + traceback before returning False to the C++ caller.

plugincontainer.cpp's "plugin failed to initialize" line now also
prints the plugin name so the proxied-candidate context is clear.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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