[RELEASE] Node activity says each program once, and says what it counted (carries #6463 and #6445)

[vivekchand]

Carries two merged Node activity fixes to PyPI.

• fix(node): a respawn is not a first sighting #6463: a respawn is not a first sighting. The sighting ledger was keyed by the run, so 1,999 of 2,000 retained events on a live node were "A process was first observed", 556 of them contactsd. A program ledger now sits beside the run ledger, so the 24 hour window holds 24 hours.
• fix: make node observations understandable and measurable #6445: observed counts shown separately from exact totals, measured process CPU intervals, a bounded lsof fallback for macOS listeners, and a selected-event story that explains the observation instead of an actor diagram no code path could fill.

No new HTTP route, so the cloud pin is a plain one-line bump with no route-policy entry needed (FLYWHEEL 6a does not apply).

CHANGELOG entries for both carried PRs are in this PR, since neither carried its own.

No-PRD: release of changes already reviewed under https://factory.8090.ai/project/b415065f-ab2f-4f53-8864-0c009fd098cb/requirements/d33e1d0b-43c1-4d3f-8d0d-8de6628d0583

🤖 Generated with Claude Code

[8090-software-factory]

✅ Drift Bot (ClawMetry): no drift detected

Drift Bot analyzed the changed files against this project's blueprints and requirements and found no drift.