Multiply capabilities: +5 languages, structural connectors, graph analysis, exporters, CI gate

[cognis-digital]

Multiply capabilities: languages, connectors, analysis, exporters, CI gate

This is an additive feature multiply on top of the existing knowledge-graph core. Public API is unchanged; every existing command still behaves the same. It also closes out several open threads (see below).

Extraction — 7 → 12 languages

• New extractors: Ruby, PHP, Kotlin, C++, Protobuf (registered by suffix + language name).
• New language-agnostic connector detector for gRPC / message-queue / env-var relationships, wired into the indexer so publisher/subscriber and shared-env couplings are captured alongside symbols.

Cross-language graph

• Resolves gRPC, MQ, and env connectors into typed cross_lang_grpc / cross_lang_mq / cross_lang_env edges, complementing the existing HTTP inference. (Addresses Resolve cross-language edges via message queues / gRPC, not just HTTP routes #7.)

Analysis (codegraph/analysis.py)

• Dependency cycles (Tarjan SCC).
• Layering violations against a declared top-to-bottom layer spec.
• CODEOWNERS ownership overlay flagging every dependency edge that crosses a team boundary.

Exporters (codegraph/exporters.py)

• JSON-graph, GraphML (Gephi / yEd / Cytoscape), and SARIF 2.1.0 findings for GitHub code scanning. (Addresses the SARIF discussion.)

CLI

• New export and ci subcommands. The ci gate exits non-zero on cycles / layering violations / broken cross-language edges, with per-check opt-outs, a findings threshold, and optional SARIF output.
• New query subcommands: connectors, cycles, layers, ownership.

MCP server

• Six new audited tools: list_connectors, cross_language_edges_by_kind, find_cycles, check_layering, ownership_overlay, broken_cross_language_edges.

Tests / demos / docs

• New test modules (analysis, connectors, exporters, new-language extraction, extended CLI, extended MCP server). Full suite: 124 passing.
• Demos 06–11 (polyglot extraction, connectors, cycles, layering & ownership, exporters, CI gate), wired into run_all.
• New polyglot sample repo (Ruby/PHP/Kotlin/C++/Go/Python services + CODEOWNERS + layers.json); README / ARCHITECTURE / DEMOS updated.

Independent of and non-conflicting with #4.