docs(environment-setup): #192 namespace/workspace flow (hold for client#192)

[LukasWodka]

The #192-dependent half of the Environment Setup audit — split out from the accuracy/structure PR (#48). These edits describe client#192 (fixed namespace tracebloc, dropped workspace-name prompt, one-per-machine guard, version-in-summary), which isn't shipped yet.

⚠️ Hold + rebase

• Do not merge before client#192 ships — otherwise the live docs describe a flow the installer doesn't have.
• Rebase onto develop after docs(environment-setup): accuracy + copy/structure (no #192 dependency) #48 lands — docs(environment-setup): accuracy + copy/structure (no #192 dependency) #48 removes the phantom HTTP_PORT/HTTPS_PORT rows from the same config table this PR adds TB_NAMESPACE to; expect a trivial table merge.

Changes

• setup-guide: drop the "choose a workspace name" step → namespace fixed to tracebloc; Version line in the install summary; verify uses -n tracebloc + the real pod list (mysql-client, jobs-manager, requests-proxy, resource-monitor).
• configuration: add the TB_NAMESPACE override; installer commands use -n tracebloc; Manual-Helm placeholders standardized to <namespace>.
• troubleshooting: one-per-machine guard entry; <namespace> placeholders.

Validated: MDX balanced, docs.json valid. Targets develop. EKS + accuracy + copy polish moved to #48.

[LukasWodka]

👋 Heads-up — Code review queue is at 13 / 8

Above the WIP limit. The team convention is to review existing PRs before opening new work.

Open PRs currently in Code review (oldest first):

• averaging-service#102 — chore(kanban): declare staging as prod-truth branch via .kanban.yml · author: @LukasWodka · no reviewer assigned
• averaging-service#98 — ci: add fr-gate caller workflow · author: @LukasWodka · no reviewer assigned
• client#192 — Installer UX: drop PriorityClass, fix namespace, one-per-machine guard, surface version · author: @LukasWodka · no reviewer assigned
• data-ingestors#146 — test(schema): lock category enum to the engine's TaskCategory (anti-drift) · author: @LukasWodka · reviewer: @saadqbal
• data-ingestors#148 — Develop to prod · author: @divyasinghds · reviewer: @saadqbal
• design-system#19 — fix: un-track coverage/ and node_modules/ from git · author: @LukasWodka · no reviewer assigned
• design-system#22 — ci: add Vitest test workflow · author: @LukasWodka · reviewer: @aptracebloc
• design-system#23 — ci: add fr-gate caller workflow · author: @LukasWodka · no reviewer assigned
• frontend-app#499 — ci: add Vitest + Cypress test workflow · author: @LukasWodka · reviewer: @aptracebloc
• model-zoo#77 — ci: add fr-gate caller workflow · author: @LukasWodka · no reviewer assigned

Pull from review before opening new work. (This is a nudge from the kanban WIP check, not a block.)