ci: add FR-pass comment + FR gate callers

[LukasWodka]

Adds two thin caller workflows for the multi-stage FR flow:

• fr-pass-comment-caller.yml — listens for /fr-pass PR comments and advances kanban items one column.
• fr-gate-caller.yml — blocks merges to staging/main/master unless contained items are in Ready for staging / Ready for prod.

All logic lives in tracebloc/.github/.github/workflows/. The callers just subscribe this repo to the central reusables.

🤖 Generated with Claude Code

[LukasWodka]

👋 Heads-up — Code review queue is at 19 / 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):

• client#100 — feat(client): scaffolding for stateless requests-proxy auth (HC-1) · author: @saadqbal · no reviewer assigned
• client#108 — chore: sync main → develop after misrouted docs PRs · author: @saadqbal · no reviewer assigned
• client-runtime#28 — Stateless JWT token · author: @saqlainsyed007 · reviewer: @saadqbal
• data-ingestors#58 — feat: add keypoint detection ingestion template · author: @shujaatTracebloc · reviewer: @divyasinghds
• data-ingestors#63 — chore: sync master → develop after misrouted docs PRs · author: @saadqbal · no reviewer assigned
• docs#14 — docs: migrate join-use-case API examples to snake_case (0.7.0) · author: @divyasinghds · no reviewer assigned
• docs#3 — Block bots from crawling Mintlify static assets · author: @LukasWodka · reviewer: @saadqbal
• docs#4 — docs: switch install to extras syntax for tracebloc_package 0.6.33 · author: @LukasWodka · reviewer: @saadqbal
• documentation-lagecy-#7 — docs: migrate start-training and hyperparameters to snake_case API (0.7.0) · author: @aptracebloc · reviewer: @LukasWodka
• model-zoo#42 — Develop · author: @divyasinghds · no reviewer assigned

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