Architecture decision records

Each record captures one decision that someone could reasonably have made differently: the context, the decision, why, what it costs, and what evidence would change it. Records are append-only once accepted. A changed decision gets a new record that supersedes the old one, and the old one's status says so.

To add one, copy the shape of an existing record, take the next number, and add a row here. A test fails if a record is missing from this table or a number is skipped.

ADR	Decision	Status
0001	One repository with protocol/, server/ and android/	Accepted
0002	A frame is one single-segment SMS, reassembled by us	Accepted
0003	Frames are base64url; denser alphabets are reserved, not built	Accepted
0004	zstd with a trained dictionary; Brotli rejected	Accepted
0005	Twilio inbound by polling; no public endpoint needed	Accepted
0006	A standalone repository that copies the LUCY family conventions	Accepted
0007	Requests are plain text, and ! answers in plain text	Accepted
0008	Links become numbered chips; the server keeps the URLs	Accepted
0009	100% coverage on the server and on all Kotlin logic; screens held by line	Accepted
0010	The phone only ever sends what a person would	Accepted
0011	Not the default SMS app in v1; minSdk 31	Accepted
0012	A hard daily segment budget with a cost meter	Accepted
0013	Optional Z85G encoding; base64url remains the default	Accepted for software testing