LogTTY Build 19 canary

Promoted the exact LogTTY 0.1.1 Build 19 candidate to the designated canary after passing host, GUI, data, signature, and rollback preflight.

• Scope: rdmbair15m5 only.
• Installed: /Applications/LogTTY.app, version 0.1.1, build 19, Direct channel, source commit b7abf60bd4a1abe0268e65b75230fe63f6586346.
• Archive SHA-256: f549d32cfcc6e8cd107100dc17e27eb058db2982dc8819c19f713a9b2348ad7c.
• Executable SHA-256: 957c1148893b2e990b573098a7e1aff367a50900787a167d1253cb0431961606.
• Commands/workflows: SSH identity and host-key verification, GUI and noninteractive-sudo preflight, exact-hash deploy script, strict code-sign verification, BuildInfo inspection, singleton process check, SQLite PRAGMA quick_check, and bounded crash/error/fault checks.
• Verification: pinned host key SHA256:HDXZpExLTrlJconcMTpEfnH+t9xRbzygqdpKMmyF5KU; universal x86_64 arm64; strict signature; clean BuildInfo; one process from /Applications; both existing databases ok; zero recent diagnostic reports and bounded error/fault records.
• Rollback: /Applications/LogTTY.app.rollback-build16-20260823T232309Z.
• Undo: quit LogTTY, preserve the Build 19 bundle, move the rollback path above back to /Applications/LogTTY.app, and relaunch from the console user session.
• Outstanding owner action: publish this changelog to the rdmbair15m5 Apple Notes folder from an Aqua Terminal session; SSH cannot send the required Notes AppleEvent.