Add docs/STORY-WORKFLOW.md (the canonical per-story execution/gate/review
protocol every roadmap issue links to) and docs/HANDOFF.md (how a new machine or
LLM picks up the work: current state, branches, the M1-M7 story index, and
coordination rules). Include the incomplete calendar API-vertical WIP as a
reference patch under docs/handoff/ (prior art for the M1 calendar story;
does not compile, apply-to-inspect only).
James Maes
97cd2d627c