Add comprehensive NVM feature gap analysis for phpvm

[Copilot]

Analyzed nvm.sh (4662 lines) against phpvm.sh (2261 lines) to identify features needed for functional parity.

Analysis Deliverables

Three documentation files (957 lines total):

• NVM_FEATURE_GAPS.md - Detailed implementation guide for each missing feature with code examples, effort estimates (~1500-2000 LOC), and 12-week roadmap
• FEATURE_CHECKLIST.md - Quick reference with priority-sorted checklist and NVM→PHPVM command mapping
• ANALYSIS_README.md - Navigation guide and onboarding for different audiences

Key Findings

Current parity: ~60% (9/22+ commands)

Critical Missing Features (HIGH priority)

1. Alias system - No version aliasing at all

   phpvm alias default 8.2
   phpvm alias production 8.1
   phpvm use default

2. Remote version listing - Cannot discover available versions before install

   phpvm ls-remote       # List all PHP versions
   phpvm ls-remote 8.2   # Filter by pattern

3. Command execution - Cannot run commands with specific versions without global switch

   phpvm exec 8.2 composer install
   phpvm run 8.1 script.php

4. Cache management - No unified cache directory or management

Important Missing Features (MEDIUM priority)

• Install/use flags: --alias, --default, --save, --silent
• Version resolution: phpvm version <pattern> for smart matching
• phpvm unload for complete shell cleanup
• phpvm reinstall-packages for extension migration
• Enhanced phpvm debug output

phpvm Advantages Over NVM

• Multi-package-manager support (apt, dnf, yum, pacman, brew)
• Built-in self-tests and system diagnostics
• Repository setup guidance for RHEL/Fedora
• WSL-specific detection

Implementation Roadmap

Phase	Duration	Features
Core	3 weeks	Alias, cache, exec/run
Remote	3 weeks	ls-remote, version resolution
Options	2 weeks	Flags, silent mode, unload
Advanced	2 weeks	Migration, debug, patterns
QA	3 weeks	Testing, docs, optimization

Total: ~15 weeks for full parity (3-5 weeks for HIGH priority only)

Original prompt

Perform a thorough scan of phpvm.sh file and come up with a list of new features that definitely need to be added in order for it to be functionally the same as nvm.sh

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