feat(hooks): title sessions "host project" for the remote session list

Remote sessions showed up on claude.ai/code and mobile under auto-generated names, so picking the right one meant guessing. Claude Code 2.1.152+ lets a SessionStart hook set the title via hookSpecificOutput.sessionTitle.

hooks/session-title.sh emits "<uname -n> <project>" (ratio rulesets, velox work) on startup and resume. Project is the git-toplevel basename so a session started in a subdirectory still names the project, with the cwd basename as fallback. The hook stays silent when a title already exists, so a /rename or an earlier run isn't clobbered on resume. The harness ignores titles on clear and compact, so the settings matcher restricts to startup|resume.

Wired in settings.json and the install-hooks snippet. As a default hook it reaches every machine through make install on the next session start.

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