Move vibe inversion into vibe task

[Copilot]

This PR moves the vibe inversion logic from the context prompt generation phase into the vibe generation phase, making the vibe "pre-inverted" when needed.

Changes Made

Before

• Vibe was generated normally in get_vibe activity
• Later, in GenerateContextPromptParams.__post_init__(), a random decision was made to invert the vibe (10% chance)
• During context prompt generation, if inversion was needed, additional instructions were added to tell the AI to respond with the opposite tone

After

• get_vibe activity now handles inversion internally with the same 10% probability
• When inverting, the AI is directly prompted to generate the OPPOSITE vibe from what was detected
• GenerateContextPromptParams no longer needs the should_invert_vibe field or random logic
• generate_context_prompt is simplified without inversion handling

Benefits

• Cleaner architecture: Vibe inversion decision happens earlier in the pipeline where it logically belongs
• Pre-inverted vibes: The vibe returned is already the final vibe to use, whether normal or inverted
• Simplified downstream logic: Context prompt generation no longer needs to handle inversion
• Preserved functionality: Same 10% inversion probability and behavior

Example

# Before: Normal vibe + later inversion instruction
vibe = "cheerful and upbeat"
# Later: "Please intentionally respond with the opposite tone from what was detected."

# After: Pre-inverted vibe when needed  
vibe = "somber and serious"  # Already inverted during generation
# No additional inversion logic needed

Fixes #63.

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[QMasterMoo]

Good start, but needs a few things

[QMasterMoo]

Please in all these sentences is not necessary. Remove and replace them with more precise language, please

[Copilot]

Removed all unnecessary "Please" words from the vibe prompt instructions and replaced them with more direct imperative statements for precise language. Commit e126708

[codecov]

Codecov Report

Attention: Patch coverage is 37.50000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 36.17%. Comparing base (10de6eb) to head (e126708).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...friendly_computing_machine/temporal/ai/activity.py	28.57%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #90      +/-   ##
==========================================
- Coverage   36.20%   36.17%   -0.04%     
==========================================
  Files          66       66              
  Lines        2563     2560       -3     
  Branches      167      167              
==========================================
- Hits          928      926       -2     
+ Misses       1624     1623       -1     
  Partials       11       11              

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