docs: focus the GraphABI organization profile

[parvbansal11]

Outcome

Focuses the organization profile on GraphABI's single public project and adds a small integrity workflow.

Changes

• leads with the schema-pass, semantics-fail product truth;
• keeps one synchronized Semantic Pulse visual and one real demo command;
• states the three operating principles: explicit contracts, trace-backed evidence, and honest uncertainty;
• preserves direct repository, website, contribution, and security paths;
• fails future pull requests that introduce an em dash, a private absolute path, a broken profile contract, or invalid local brand assets.

Verification

• profile command matches the current Git install path;
• logo and animation hashes match the canonical core assets;
• local profile and text checks pass;
• no new repository, product, integration, or adoption claim is introduced.