Add Windows PowerShell support, .env config, and dependency auto-install

[adam110th]

Summary

• Windows PowerShell scripts: Full ports of install.sh, uninstall.sh, and statusline.sh as .ps1 equivalents — no jq dependency on Windows (uses native ConvertFrom-Json/ConvertTo-Json)
• .env file support: All scripts (bash and PowerShell) now read ANTHROPIC_API_KEY from .env files as an additional key source, with single-quoted value format
• Interactive dependency auto-install: When missing dependencies are detected, install scripts offer to download and install them (uv via official script, jq/curl via detected package manager)

New Files

File	Description
install.ps1	Windows installer — identical behavior to install.sh, native JSON, ANSI colors
uninstall.ps1	Windows uninstaller — manifest, confirm, clean removal
statusline.ps1	Status line + cached background poller via Invoke-RestMethod and Start-Process -WindowStyle Hidden
.gitignore	Python, bash, IDE, OS, secrets patterns
.env.example	Commented template: ANTHROPIC_API_KEY='sk-ant-your-key-here'

Modified Files

File	Changes
install.sh	.env reading, SCRIPT_DIR moved before key resolution, interactive dep auto-install
statusline.sh	.env fallback in background poller
README.md	Windows install/uninstall sections, updated options table, file tree, Windows troubleshooting

Design Decisions

• Native PowerShell JSON — eliminates jq dependency on Windows
• Same export ANTHROPIC_API_KEY="..." env file format — cross-platform compatibility
• ANSI via [char]27 — works in Windows Terminal and modern PowerShell
• Start-Process -WindowStyle Hidden with -Poll self-invocation — replaces & disown for background polling
• Atomic writes — temp file + Move-Item -Force (same pattern as bash)

Test plan

• .\install.ps1 -Help — verified help output
• .\install.ps1 -ApiKey test-key -Unattended — full install flow completes
• .\uninstall.ps1 -PurgeData -Unattended — full uninstall flow completes
• echo '{"model":"claude-opus","contextPercent":42,"cost":"1.23"}' | powershell -File statusline.ps1 — outputs [Opus] | 42% | $1.23
• End-to-end: install, submit a batch job, verify statusline polling

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