template-chart: NOTES.txt and the naked-integer render fix (4.1.0+upxxx)

Two changes to the reference implementation, both of which every chart copied from it inherits.

Render fix (part of #157): multiplyQuantity turned its input into a string with printf "%v". The null-safe fallback helpers pass values through fromYaml, which parses every number as float64, and Go's "%v" switches float64 to exponential notation from about 1e6 upwards - so a bare byte count like 1048576 arrived as "1.048576e+06" and the suffix check aborted the render. A new xxx.formatNumber helper forces plain decimal notation on both the input and the non-integer product; strings like "512Mi" pass through untouched. This is the canonical fix agreed for the issue, taken over verbatim, because multiplyQuantity is the same copy in every chart and a private variant would create drift instead of a solution. The toYaml/fromYaml round-trip is deliberately not touched: it is not the cause.

NOTES.txt (part of #43): the scaffold now carries the reference NOTES.txt - a placeholder-carrying template, not finished prose. It renders the access URL from ingress.domain (no real domain anywhere), names which fields the 1Password item must carry, and prints the chart's traps: the placeholder image, the fact that both a Deployment and a StatefulSet render, and that no checksum/secret-ref means a secret change restarts nothing here. Output is conditional on the values actually set.

appVersion unchanged; minor bump because both changes are additive.

template-chart/Chart.yaml

@@ -5,7 +5,7 @@ icon: https://helm.sh/img/helm.svg
 
 type: application
 
-version: 4.0.0+upxxx
+version: 4.1.0+upxxx
 appVersion: "xxx"
 
 maintainers: