Initial commit: capability prober + design docs

Monorepo root for Echolot. Contains the no-root capability prober
(Kotlin/Compose, app.echo_lot.prober) and the four design docs that act
as the contract for the production app and the Go server.

LICENSE is deliberately absent — still undecided, see docs/build-status.md.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.gitattributes

@@ -0,0 +1,15 @@
+# Normalize to LF in the repo and in the working tree. Windows tooling copes;
+# CRLF in gradlew does not (it breaks the shebang under Git Bash / on CI).
+* text=auto eol=lf
+
+gradlew      text eol=lf
+*.sh         text eol=lf
+*.bat        text eol=crlf
+*.cmd        text eol=crlf
+
+*.jar        binary
+*.apk        binary
+*.aab        binary
+*.keystore   binary
+*.jks        binary
+*.png        binary