feat(otel): propose browser behavioral analytics semantic conventions

[brucearctor]

Summary

Propose OTel semantic conventions for browser behavioral analytics to the OpenTelemetry specification.

Proposed Conventions

Attribute	Type	Description
browser.dom.target	string	CSS selector of interaction target
browser.dom.path	string[]	DOM path from target to root
browser.event.type	string	DOM event type (click, keydown, etc.)
browser.session.id	string	Behavioral session identifier
browser.viewport.width	int	Viewport width in pixels
browser.viewport.height	int	Viewport height in pixels
browser.pointer.x	double	Pointer X coordinate
browser.pointer.y	double	Pointer Y coordinate

Process

1. Validate mapping via Flagon's OTLP exporter (feat(export): OTLP/JSON exporter for OpenTelemetry integration #140)
2. Draft OTEP (OpenTelemetry Enhancement Proposal)
3. Submit to opentelemetry-specification repo
4. Iterate based on SIG feedback

Depends On

• feat(export): OTLP/JSON exporter for OpenTelemetry integration #140 (OTLP exporter — proves mapping works in practice)
• Community validation via demo (feat(demo): Grafana + OTel Collector docker-compose demo #141)