[Feature]: new bug-filing-mcp cartridge wrapping the real feedback-o-tron engine

[hyperpolymath]

Part of #274 (pipeline epic); implements D0=new-wrapping-cartridge.

Problem

The real bug-filing engine is not reachable as a boj cartridge. The existing feedback-mcp cartridge is an unrelated sentiment counter (left untouched per D0).

Solution

Add a new first-class cartridge bug-filing-mcp in boj-server-cartridges whose tool submit_feedback maps to the engine's HTTP intake (POST http://127.0.0.1:7722/api/v1/submit_feedback, see companion intake issue). JS-worker (mod.js) cartridge — no FFI .so claims. Gateway reaches it via POST /cartridge/bug-filing-mcp/invoke {tool:submit_feedback, arguments:{title,body,repo}}.

Scope

Small. New cartridge dir; does not touch feedback-mcp.

Delivered by a draft PR in boj-server-cartridges.

[hyperpolymath]

Follow-up note: the cartridge shipped here as v0.1 is now v0.2 via boj-server-cartridges#85 — promoted to Teranga (core), exposing the engine's full interactive loop (research_feedback → synthesize_feedback → submit_feedback with fail-closed template_data validation) and completing the standard cartridge layout (ffi/abi/panels/tests). Bundled into boj-server via #285.

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