[docs] Unbloat deterministic-agentic-patterns.md documentation

[github-actions]

Summary

Reduced guides/deterministic-agentic-patterns.md from 303 lines to 195 lines (35.6% reduction, 108 lines removed) while preserving all essential technical information.

Changes Made

Condensed verbose sections:

• "When to Use This Pattern" - converted bullet list to concise prose
• "Best Practices" - compressed from multiple code blocks to two brief bullet points
• "Agent Data Directory" - removed redundant bullet points and examples

Streamlined code examples:

• Removed unnecessary name: fields from step definitions
• Consolidated YAML syntax for cleaner presentation
• Eliminated redundant explanatory text after code blocks

Removed duplicate content:

• Deleted "Pattern Examples" section (concepts already demonstrated in main examples)
• Consolidated "Importing Shared Steps" section to show just the import pattern

Improved readability:

• Removed filler words and phrases throughout
• Made descriptions more direct and actionable
• Maintained all technical accuracy

Bloat Reduction Breakdown

• Excessive bullet points → concise prose
• Redundant examples → streamlined demonstrations
• Verbose descriptions → direct, technical language
• Duplicate patterns → consolidated single examples

Issues Encountered

Screenshot Capture Failed:
The documentation preview server started successfully on (redacted) but Playwright was unable to connect to capture screenshots. The server was listening on IPv6 localhost (::1:4321`), which may have caused a connection issue with Playwright's browser instance.

Verification:

• Server confirmed running via curl and netstat
• Page content accessible at `(redacted)
• Playwright connection failed with ERR_CONNECTION_REFUSED

No screenshots are included in this PR due to this technical limitation.

Verification

All changes preserve:

• Technical accuracy
• Code examples functionality
• Essential configuration details
• Links to related documentation

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