v0.7.1

docs: add getting started instructions to installers

After installation completes, both bash and PowerShell installers now
display clear getting started steps:

1. cd
2. pm init
3. pm start

Also includes a helpful tip about using 'pm status' to monitor indexing
progress while noting that Pommel works with a partial index too.

🤖 Generated with Claude Code

Co-Authored-By: Claude Opus 4.5 noreply@anthropic.com