Reset flag state before completion

[M09Ic]

Background

Console completion reuses cobra command trees. Flags parsed by an earlier completion or execution can leave Changed, values, and ArgsLenAtDash state behind, which can influence later completion results for the same command tree.

Approach

• Locate the command being completed from the current input words.
• Reset that command's flag values and Changed state before invoking carapace completion.
• Reset ArgsLenAtDash on the target command and its parents.
• Keep this scoped to the completion path.

Tests

• Added coverage that a previously changed bool flag is restored before completion.
• Added coverage that ArgsLenAtDash is restored after a previous parse containing --.
• Ran go test ./...

[codecov]

Codecov Report

❌ Patch coverage is 67.39130% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 24.82%. Comparing base (7002774) to head (d62f7dd).

Files with missing lines	Patch %	Lines
completer.go	67.39%	10 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #83      +/-   ##
==========================================
+ Coverage   22.54%   24.82%   +2.27%     
==========================================
  Files          27       27              
  Lines        2045     2091      +46     
==========================================
+ Hits          461      519      +58     
+ Misses       1554     1533      -21     
- Partials       30       39       +9     

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