docs: strip references

[0xvasanth]

Summary

Removes every mention of the four LangChain-team products (LangChain, LangGraph, DeepAgents, LangSmith) from active code, docs, and the contributor templates. Langfuse references are kept — it's an integrated tracing backend (the LangfuseExporter ships in cognis-trace), not a sibling product.

Highlights

• README, CLAUDE.md, introduction.mdx: dropped the "inspired by" notes and rewrote the framing in neutral language that describes what Cognis is on its own terms.
• get-started/comparison.mdx: deleted. The page existed only to compare Cognis to those projects; without them it has no reason to be there. docs.json and inbound links updated.
• observability + trace reference: dropped the "LangSmith" roadmap mentions; OpenTelemetry remains the named Phase-2 target.
• graphs / streaming / patterns: replaced "LangGraph-style" / "inspired by LangGraph" with "Pregel-style".
• Renamed the misleading example: examples/graphs/langgraph_agent.rs → agent_builder_graph.rs (registered name graphs_langgraph_agent → graphs_agent_builder). The example never used LangGraph code; the name was a misleading hint.
• Module doc-comments scrubbed in cognis-core/src/callbacks.rs, cognis/src/history.rs, cognis/src/observers/{mod,tracing_observer}.rs, cognisgraph/src/stream_mode.rs, cognis-rag/src/splitters/recursive.rs, cognis-trace/{Cargo.toml,src/lib.rs}.
• README tracing row + cognis-trace feature table: dropped the langsmith feature flag from the listing — it was never implemented; only stdout and langfuse exist in cognis-trace/Cargo.toml.
• .github/PULL_REQUEST_TEMPLATE.md: was listing the legacy V1 crate names (rustchain-core, rustchain, langgraph, deepagents). Refreshed to the current v0.3 layout.
• .github/CONTRIBUTING.md: rewritten for the current workspace; trimmed since full contributor docs live in docs/mintlify/contribute/.

Test plan

• grep -rEni 'langchain|langgraph|deepagents|langsmith' across active code and docs returns zero matches.
• cargo check -p cognis-core -p cognis-llm -p cognis-rag -p cognis-graph -p cognis-trace -p cognis passes.
• cargo check -p cognis-examples --example graphs_agent_builder passes (renamed example builds).
• Mintlify preview renders cleanly (Mintlify Deployment check will run).

Notes

• crates/v1/ was excluded from the scrub on purpose — that directory is the frozen V1 source and isn't user-facing.
• Langfuse references stay (integrated backend, real shipping code).
• Provider names (Ollama, OpenAI, Anthropic, Google, Azure, OpenRouter, Voyage) stay (real integrations).

---

Summary by cubic

Removes all mentions of LangChain, LangGraph, DeepAgents, and LangSmith from code, docs, and contributor templates to make the project self-contained. Langfuse stays supported; OpenTelemetry remains on the roadmap.

• Refactors
  • Deleted docs/mintlify/get-started/comparison.mdx; updated docs.json and links.
  • Rewrote docs to neutral “Pregel-style” phrasing; scrubbed module doc-comments.
  • Renamed examples/graphs/langgraph_agent.rs → agent_builder_graph.rs; updated crates/examples/Cargo.toml and docs.
  • Dropped langsmith from cognis-trace description and feature list; clarified OTel as Phase 2.
  • Updated .github/PULL_REQUEST_TEMPLATE.md and .github/CONTRIBUTING.md to current crate layout (cognis-core, cognis-llm, cognis-rag, cognis-graph, cognis-trace, cognis-macros, cognis).
  • Verified grep returns zero matches and cargo check (incl. renamed example) passes.

^{Written for commit 0474cbe. Summary will update on new commits.}

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Project	Status	Preview	Updated (UTC)
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