pas-metrics docs: update release notes, document Notebook, add cross-links

[qa-assist-bot]

Gaps identified during QA review of HealthSamurai/smartbox#698:

DOC-01 (high): Release notes reference outdated version

releases.md line 31 says pas-metrics 0.1.2, available on request. Current version is 0.1.6 with a public download link. The entry should:

• Update version to 0.1.6
• Replace "available on request" with a link to the PAS Metrics page
• Add release note entries for 0.1.5 (Metric 7 per-payer scoping) and 0.1.6 (Metric 4 exchange-level counting)

DOC-02 (high): Notebook resource not documented

The package ships Notebook-pas-metrics.json (11 cells: intro + interactive chart per metric). This is not mentioned in docs/analytics/pas-metrics.md. Users should know:

• That the Notebook exists and what it provides
• That it requires separate installation via PUT /Notebook/pas-metrics (since $fhir-package-install skips non-canonical resource types like Notebook)

DOC-03 (medium): No cross-link from PAS pillar page

docs/prior-auth/pas.md does not reference the PAS Metrics analytics page. A short mention (e.g., in a "See also" or "Analytics" subsection) would help PAS users discover the metrics capability.

DOC-04 (low): "Generated ids" wording

docs/analytics/pas-metrics.md line 114 says "the package installs with generated ids". The Library resources in the package have stable hardcoded id fields (e.g., metric-07-time-to-final-result). Users can reference them by ID directly. Consider removing or correcting this guidance.