Decisions

Architecture decision records: choices a reader would otherwise try to "undo". Each says what was decided, why, and what was given up.

#	Decision
0006	A Flow keeps its state in its folder, not in the database
0007	The analytics agent cannot run a Flow

New records go in docs/adr/NNNN-title-as-a-sentence.md and are added to mkdocs.yml's nav.