feat: improve CLI output formatting

[giordano-lucas]

• Filter out nil fields globally in text formatter instead of showing
• Add custom formatters for page execute responses (hide Session field)
• Add page observe command that returns page description
• Make page scrape instruction argument optional
• Add shared PrintScrapeResponse helper for consistent scrape output
• Update all scrape commands to use the shared helper

Greptile Overview

Greptile Summary

This PR improves CLI output formatting and adds new functionality. The changes include:

• Globally filters out nil fields in text formatter instead of displaying <nil>
• Adds PrintScrapeResponse helper function for consistent scrape output formatting across all scrape commands
• Adds new page observe command that displays page description
• Makes page scrape instructions argument optional
• Adds custom printExecuteResponse formatter to hide Session field in text mode for execute responses
• Updates all scrape-related commands (scrape, page scrape, session scrape) to use the shared helper
• Includes comprehensive test coverage for new functionality

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• All changes are well-tested with comprehensive unit tests, the refactoring consolidates duplicate code into a shared helper, and the new functionality follows existing patterns in the codebase
• No files require special attention

Important Files Changed

Filename	Overview
internal/output/text.go	improved nil field filtering to hide nil pointers, slices, maps, and interfaces globally in text formatter
internal/cmd/output_helpers.go	added PrintScrapeResponse helper for consistent scrape output formatting across commands
internal/cmd/page.go	added page observe command, made scrape instructions optional, added custom formatter for execute responses

[greptile-apps]

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