[architect] refactor: remove dead pkg/hub Go SVG quadrant renderer (quadrant_render.go)

[kubestellar-hive]

Refactor

Deletes src/pkg/hub/quadrant_render.go (228 LOC) and quadrant_render_test.go, and drops TestDeltaSignAndAbs from small_seams_test.go. -382 LOC, no additions.

Claimed ground: exactly pkg/hub/quadrant_render.go, pkg/hub/quadrant_render_test.go, and the TestDeltaSignAndAbs case in pkg/hub/small_seams_test.go — the dead Go functions quadrantPoint, quadrantPolygon, axisByName, quadrantSVG, axisShortLabel, deltaSign, abs, quadrantAriaLabel. Disjoint from PR #5697 (wrapkey* envelope encryption) and every other open PR.

Why it is dead: the quadrant kite is rendered client-side by the JS reimplementation embedded in saas.go (~line 10714) — quadrant_dashboard_test.go asserts those JS functions exist in the served page. deadcode ./cmd/... reports every function in the Go file unreachable; the only callers were its own tests.

Untouched: live quadrant scoring — quadrant.go, quadrant_score.go, quadrant_axes.go, quadrant_attach.go — and the JS renderer in saas.go.

Validation: go build ./..., go vet ./pkg/hub/, go test ./pkg/hub/ all green.

Fixes #5745. Part of the #5694 dead-code inventory (non-closing).

---

Filed by architect agent (ACMM L5 — hold-gated mode). Hold-gated: human review required.

— hive: agent=architect backend=copilot model=claude-opus-4-6

[github-actions]

Changelog: this PR changes code but carries no changelog entry
(no changelog.d/ fragment and no CHANGELOG.md edit).

If it is user-visible — a feature, a fix an operator would notice, a
security change, a migration, a deprecation, or anything breaking —
please add a fragment file changelog.d/<category>-<pr-or-slug>.md
containing exactly your entry (see changelog.d/README.md; the
category is one of added/changed/deprecated/fixed/security). Please
do not append to CHANGELOG.md's ## Unreleased directly — that
shared section is the merge-conflict generator fragments replaced
(#5675). If it is a refactor, a test-only change, or dependency
churn, no entry is needed and you can ignore this.

This is a reminder, not a gate; it never blocks a merge.

[clubanderson]

Reviewed the full deletion and verified the removed Go SVG renderer symbols are not called from v4 product code; current dashboard rendering uses the JavaScript implementation in saas.go. Also checked v5 references: only the same orphan Go file/tests plus JS renderer remain, with no product call into the Go renderer. go build ./... and go test ./pkg/hub pass.

[kubestellar-prow]

LGTM label has been added.

Details

Git tree hash: 0ac8acd9d67658b9c3b5ed906a3da9730c780bf1

[clubanderson]

Re-reviewed after adding the required changelog fragment. The removal remains limited to an unused Go renderer/tests; build and hub package tests passed.

[kubestellar-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[kubestellar-prow]

LGTM label has been added.

Details

Git tree hash: 632ba4adb43bf735db52f915ce63cbcd3462172c

[clubanderson]

Re-reviewed after renaming the changelog fragment to the guard's required category format. Verdict remains approve.

[kubestellar-prow]

LGTM label has been added.

Details

Git tree hash: f4ec5002614e4c38725fc2b0fe49368ef5cff5cb

[github-actions]

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