fix: migrate SSH relay bootstrap paths from ~/.cmux to ~/.programa (#15)

[arzafran]

What this does

SSH-remote panels' relay warmup and TTY reporting were silently broken. The SSH bootstrap script generators in CLI/cmux.swift still wrote to the old ~/.cmux/... paths and looked for a cmux binary on the remote host, while the rest of the daemon (Sources/Workspace.swift, daemon/remote/cmd/programad-remote/cli.go) already moved to ~/.programa/... and the programa binary. The result: the remote relay CLI was never found, and the remote wrote the TTY name to a directory the Mac app never reads. This realigns the bootstrap scripts so SSH-remote relay actually works.

Summary

16 remote-host string sites in CLI/cmux.swift migrated:

• Relay auth read path ~/.cmux/relay/<port>.auth → ~/.programa/relay/...
• Bootstrap/shell-state dirs and TTY writes ~/.cmux/relay/ → ~/.programa/relay/
• Relay CLI lookup + warmup ~/.cmux/bin/cmux / command -v cmux → ~/.programa/bin/programa / command -v programa
• PATH injection and PROGRAMA_BUNDLED_CLI_PATH → ~/.programa/bin/programa

Scope: only remote-host shell path/binary literals. No Swift symbols, local-Mac paths, DispatchQueue labels, theme bundle IDs, or product/scheme names were touched.

Note: three adjacent command -v cmux sites (session-end hook, codex hook) are also stale for the remote but fall outside this issue's scope and are left for a follow-up.

Test Plan

• CI build passes
• tests_v2/test_ssh_remote_*.py suite green

Fixes #15