Recover from completion panics

[M09Ic]

Background

A panic during completion currently escapes the completion path and can bring down an interactive console. Completion is usually triggered while typing, so a single bad completer or transient command-tree state should degrade into a visible completion error instead of crashing the process.

Approach

• Add a deferred recover around Console.complete.
• Return a readline completion message containing the panic value.
• Reset the menu command state after a recovered panic so the next completion starts from a clean command tree.

Tests

• Added a regression test that forces a nil command-tree panic and verifies complete does not panic.
• Ran go test ./...

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 23.18%. Comparing base (7002774) to head (c47f10f).

Files with missing lines	Patch %	Lines
completer.go	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
+ Coverage   22.54%   23.18%   +0.63%     
==========================================
  Files          27       27              
  Lines        2045     2049       +4     
==========================================
+ Hits          461      475      +14     
+ Misses       1554     1544      -10     
  Partials       30       30              

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