Merge branch 'main' of git.arirex.me:iris/ai-app

# Conflicts:
#	AGENTS.md
#	PLAN.md
#	app/androidApp/src/main/kotlin/com/example/aiapp/SessionUsageBar.kt
#	app/androidApp/src/main/kotlin/com/example/aiapp/SpawnScreen.kt
#	server/src/config.rs
#	server/src/main.rs
#	server/src/routes.rs
#	server/src/session/echo.rs
#	server/src/session/llama.rs
#	server/src/session/transport.rs
#	server/src/ssh.rs
#	server/src/usage.rs

server/Cargo.toml

@@ -23,7 +23,13 @@ tokio-stream = { version = "0.1", features = ["sync"] }
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 serde = { version = "1", features = ["derive"] }
-serde_json = "1"
+# `float_roundtrip` because this server hands out the same transcript line two ways -- the
+# `/transcript` page and the SSE backlog both parse it out of the file and serialize it again --
+# and serde_json's default float parser is not correctly rounded. Measured 2026-09-04: a `ts` of
+# 1788546972.6030757 in the file came back as ...0755, so the two answers to "what is line 30"
+# differed in the last bit while looking identical. What made that visible was the phone's
+# transcript cache, which compares a line it already holds against the server's own answer.
+serde_json = { version = "1", features = ["float_roundtrip"] }
 # The config file's format. Not JSON, because this file is written and read
 # by hand and RON says a sum type as syntax. The two house rules both
 # projects write it under live in wg-app-link; this is here for the error