promote: advance-deploy-env caller to main

[LukasWodka]

Promotes the advance-deploy-env caller (#78) to main, so .github's own pushes to main run it and its kanban tickets auto-advance to Prod on ship (they were stranding at FR on dev).

Also carries any other develop commits ahead of main. Merge with a merge commit.

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Note

Low Risk
CI-only change that wires an existing reusable workflow on push; no application or auth logic.

Overview
Adds advance-deploy-env-caller.yml, which runs on pushes to develop, staging, master, and main and invokes the reusable tracebloc/.github/.github/workflows/advance-deploy-env.yml@main with inherited secrets.

Because this repo only hosted the reusable workflow (workflow_call) and had no push trigger, kanban items for work here did not advance when code shipped through develop → main; tickets could stay at FR on dev while promotion alone reached Prod. This mirrors the other repos so merges to main auto-advance contained tickets to Prod.

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[LukasWodka]

👋 Heads-up — Code review queue is at 39 / 30

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#207 — Promote develop → staging · author: @shujaatTracebloc · no reviewer assigned
• backend#1201 — docs(rfc): Data spaces & federated dataset composition (draft) · author: @LukasWodka · no reviewer assigned
• backend#1217 — docs(rfc): Dataset integrity & score reproducibility (draft) · author: @LukasWodka · no reviewer assigned
• backend#1228 — Promote develop → staging · author: @shujaatTracebloc · reviewer: @saadqbal
• backend#1244 — fix(experiments): surface save-time failures as 5xx + guard new NOT NULL columns · author: @LukasWodka · reviewer: @saqlainsyed007
• backend#1251 — docs(bugbot): add .cursor/BUGBOT.md project context (#930) · author: @LukasWodka · no reviewer assigned
• backend#1254 — docs(pr-template): owner-qualify cross-repo closing keywords · author: @LukasWodka · no reviewer assigned
• backend#1259 — docs(rfc): qualified RFC identifiers + org-wide index · author: @LukasWodka · no reviewer assigned
• backend#1261 — RFC-BACKEND-0008: board & process reset (decision RFC — for markup) · author: @LukasWodka · no reviewer assigned
• cli#397 — Release develop → main · author: @shujaatTracebloc · no reviewer assigned

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