Prod: chore: remove legacy per-platform charts and stale build artifacts (closes #70) (#83)

[saadqbal]

The chart unification (4 per-platform charts -> unified client/ chart) shipped in v1.1.0; the unified chart has now been at v1.2.x in production across stg + hasan-prod for several releases. Time to retire the legacy artifacts.

Removed:

• aks/, bm/, eks/, oc/ chart directories — 75 files, ~330KB. Each had a DEPRECATED.md pointing at the unified chart for ~6 months.
• 7 stale .tgz tarballs at repo root (aks-1.0.3, aks-1.0.4, bm-1.0.3, bm-1.0.4, eks-1.0.3, eks-1.0.4, oc-1.0.4). The release workflow publishes via gh-pages; these checked-in builds were dead weight.
• Root index.yaml — stale snapshot listing only 1.0.3/1.0.4 of the legacy charts. The live index served at tracebloc.github.io/client is on the gh-pages branch and is the source of truth.
• mysql.yaml at repo root — orphaned PVC manifest with hardcoded volume UUID and namespace. Audited: zero references anywhere in the repo.

Other:

• Added *.tgz to .gitignore so chart packages don't sneak back in.
• Updated client/MIGRATION.md Rollback section. The old "the legacy charts remain in aks/, bm/, eks/, oc/ and can be used at any time" was about to become a lie. Replaced with instructions to recover the directory from git history if anyone genuinely needs the old chart.

Verification:

• helm lint --strict ./client -f client/ci/eks-values.yaml — clean (same invocation the release workflow runs on every tag)
• helm unittest client — 105/105 still passing
• helm package ./client -d /tmp — produces a valid client-1.2.3.tgz

Net diff: 86 files changed, 17 insertions(+), 3447 deletions(-).

Summary

Related

Type of change

• Feature
• Bug fix
• Tech-debt / refactor
• Docs
• Security / hardening
• Breaking change

Test plan

Screenshots / recordings

Deployment notes

Checklist

• Tests added / updated and passing locally
• Docs updated if behavior or config changed
• No secrets / credentials in the diff
• For security-sensitive paths: appropriate reviewer requested

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Note

Low Risk
Mostly deletes unused chart directories and stale packaged artifacts; behavior only changes for anyone still relying on the removed in-repo legacy charts.

Overview
Removes the legacy per-platform Helm charts (aks/, bm/, eks/, oc/) and associated published artifacts from the repo (including index.yaml and an orphaned mysql.yaml PVC manifest), leaving the unified client/ chart as the only in-repo chart source.

Updates .gitignore to ignore Helm package tarballs (*.tgz) and adjusts client/MIGRATION.md rollback guidance to instruct recovering legacy chart directories from git history if ever needed.

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