feat(edge): strengthen fleet reporter delivery

[barton87]

Closes #24.

Bounty-board submission for the Edge Reporter Module.

Summary

This PR strengthens pkg/edge/reporter.go as a Fleet Manager / MoltClaw reporter while keeping the existing edge config shape compatible:

• sends startup registration to /fleet/register
• sends immediate + periodic heartbeats to /fleet/heartbeat
• adds configurable periodic status reports to /fleet/status
• keeps synchronous ReportEvent delivery to /fleet/events
• adds bounded asynchronous QueueEvent delivery for non-blocking event reports
• keeps gene publishing to /fleet/genes/publish
• includes gene stats in heartbeat and high-confidence genes in status snapshots
• adds bearer auth plus X-Clawland-Node-ID headers
• normalizes trailing-slash endpoints and rejects empty cloud endpoints clearly
• makes Stop() idempotent
• exposes SetHTTPClient for tests and embedded transports
• returns bounded response-body details on non-2xx fleet responses
• documents reporter endpoints and adds status_seconds config/env support

I also included the small deterministic pkg/gene.SelectGenes tie-breaker fix so the repository-wide Go suite passes while reviewing this reporter branch.

Validation

• go test ./pkg/edge ./cmd/picoclaw ./pkg/gene -> passed
• go test ./... -> passed
• git diff --check -> passed

Notes

This is an independent implementation for the Edge Reporter bounty. It is test-backed and covers registration, heartbeat, status, event, queued event, gene publishing, auth headers, endpoint normalization, failure detail, empty endpoint handling, interval defaults, and idempotent shutdown.