Release v1.4.3 — promote installer hardening to production

[saadqbal]

Goal

Promote the installer-hardening series (#171–#175, merged to develop) to production by syncing develop → main and cutting chart release v1.4.3.

Context

• develop is 6 commits ahead of main; all changes are installer scripts / CI / docs — no changes to client/ (Helm chart) or ingestor/ (chart artifacts will be byte-identical to v1.4.2).
• The public installer one-liner runs from main (BRANCH=${BRANCH:-main}), so this work does not reach users until the sync lands.
• Quality: validated end-to-end (live AlmaLinux self-heal + real-creds "Connected" run).

Steps

• Bump client/Chart.yaml version + appVersion 1.4.2 → 1.4.3 (PR to develop)
• Sync develop → main for v1.4.3 chart release (PR to main)
• Publish GitHub Release v1.4.3 (tag on main) → triggers release-helm-chart.yaml chart packaging to gh-pages
• Back-merge: Sync main → develop after v1.4.3 release

Notes

Installer-only patch release; chart content unchanged from v1.4.2.

[saadqbal]

Closed via board reconciliation (moved Backlog → Status: Prod / Deploy environment: prod, which auto-closed this issue). Chart v1.4.3 was published to gh-pages on 2026-06-02 (installer-hardening patch; chart content identical to v1.4.2) and the fleet has since moved well past it — v1.6.1/v1.7.0/v1.7.1 are live. The card had just never been moved off Backlog.