feat: django skill

[sarahxsanders]

adds Django support to the wizard:

• detects Django w/ requirements files + manage.py
• added Django agent and detection utilities
• modified integration enum, config, and run.ts to support Django
• agent prompt updated to handle Python projects (and other projects w/o package.json)

feature flag wizard-django is disabled, will enable after merge: https://us.posthog.com/project/2/feature_flags/431237

Testing

to test, I built the wizard from this branch + ran it against a sample project + doubled down and ran it against my examples repo project. wizard successfully detected Django and initialized PostHog, added middleware, added events to views, and created setup report. also ran the wizard-workbench eval w/ a 4/5 confidence score on both projects

[daniloc]

really cool. Small architectural tweak you can do now or defer to a cleanup run (assuming you can run this against, say, a Next project and it doesn't do anything weird)

[sarahxsanders]

for the conflict: https://github.com/PostHog/wizard/pull/230/conflicts @daniloc

are the incoming changes the correct ones?

[daniloc]

yes: we need the new startup prompt for sure because it triggers the skill-based integration instead of using MCP resources