docs: describe AI use in my own voice

ai.md

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+# AI assistance
+
+I am an AI-assisted systems developer. I use automation to scale how much I can
+build, but I still own the architecture, the constraints, the integration and
+the final result.
+
+For Nereus, the main assistants were Codex CLI and Claude Code CLI, using
+GPT-5.6 Sol and Sonnet 5.0. Some application code, infrastructure configuration
+and documentation were drafted or implemented by those tools. Other parts were
+written by me. The agents handled a lot of the repetitive implementation work;
+I decided how the system should fit together, reviewed the changes and ran them
+against the real environment.
+
+The debugging process was also mixed. I investigated some failures manually
+through logs, metrics, packet paths and command-line tools. Some research came
+from Google and official documentation. Other problems were handled through AI
+sessions or longer Codex loops that inspected the current failure, changed one
+thing, reran the check and continued until the system reached the expected
+state.
+
+Most of the difficult failures were not application-code problems. They were
+networking and integration details: firewalld blocking VXLAN, permissions on
+pod log files, missing RBAC verbs, incorrect image tags, stale buoy IDs after a
+database reset and Prometheus windows that still contained earlier errors.
+Those are the parts I debugged on the actual hosts and cluster. An AI-generated
+configuration was never treated as working just because it looked correct.
+
+I am responsible for the final project. AI helped type, research and iterate;
+the architecture, acceptance criteria, hardware debugging, system integration
+and final review remained mine. The checks that actually passed are recorded in
+`docs/evidence.md`, and anything still dependent on external hardware or
+credentials is marked honestly in `docs/roadmap.md`.