[NOTICKET] docs: correct 13f74e1 root cause — Go migrations are non-convergent

[NOTICKET] fix: write reports.user_id (Neon NOT NULL column broke report persistence)

/fix change model to gpt 5.4 mini (#17)

fix/ check and new chart tool (#16)

/fix traceability (#15)

/fix planner and report (#13)

/feat traceability (#11)

/fix analysis + report_inputs and storage update (#9)

/fix message_id for chat/stream Endpoint (#6)

feat/ Endpoint Restructure (#5)

feat/Analysis State & Report Rework (#4)