GA4: Expand product telemetry and add internal traffic filtering

[sbaker]

Summary

Expand GA4 analytics to capture comprehensive product telemetry (no PII) and add internal traffic filtering so developer usage doesn't skew reports.

Internal Traffic Filtering (done)

• Added ~/.prompd/.internal marker file check at analytics init
• Tags events with traffic_type: internal user property when marker exists
• GA4 Data Filter needed: exclude where traffic_type = internal

Telemetry Expansion (TODO)

Currently tracked (6 events)

• app_open, app_close, prompt_execute (provider only), workflow_execute (no params), deployment_create, package_install

Functions exist but never called

• prompt_compile, file_open, feature_use

Missing events to add

• Model/provider tracking: model name, provider on every execute event
• Compilation: success/fail, stage that failed, error code, duration
• Workflow: node types used, node count, execution duration, success/fail
• Editor: file type opened (.prmd, .pdflow, .pdpkg), tab count
• Registry: search queries (not content), package views, install source
• Chat mode: mode used (agent, brainstorm, edit, plan), turns per session
• MCP: tool invocations, server count
• Errors: error codes (no stack traces or file paths)
• Session: duration, features touched per session
• Deployment: trigger type, schedule frequency, success/fail

Privacy constraints

• No PII, no file names, no prompt content, no file paths
• Opt-in only (existing consent flow)
• Anonymous UUID client ID (existing)
• No privacy policy change needed for product telemetry

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