Ollama routing, interactive cell picker, desktop theme

[DimmKirr]

Changes

• feat(claude): add --ollama flag and [claude] use_ollama config for local ollama routing
• feat(vnc,rdp): replace --app flag with positional arg, add interactive cell picker
• feat(apparg): add resolveAppArg with suffix expansion and shell completion
• feat(desktop/theme): add neobrutalist fluxbox theme with design tokens and Xresources
• feat(ux): add GetSelection interactive picker and spinner timer display
• feat(cfg): add [claude] and [asdf] config sections with merge semantics
• feat(opencode): auto-detect ollama models, merge config into .opencode.json on disk
• feat(ollama): add FormatActiveTOMLSnippet, loose fallback score matching, new model ratings
• chore(entrypoint): add debug timestamps [X.XXXs], skip unchanged .tool-versions via checksum
• chore(entrypoint): remove xrdp-sesman, replace sleep with polling loops
• chore(root): replace syscall.Exec with cmd.Start/Wait and signal forwarding
• chore(scaffold): add [claude], [asdf], [env] sections to devcell.toml template
• chore(build.dev.yml): rename DEVCELL_IMAGE to DEVCELL_TEST_IMAGE
• refactor(test): extract helpers_test.go with sync.Once image builds, add TestMain cleanup
• test(claude): add ollama flag injection, stripping, and config-based tests
• test(apparg): add positional arg, suffix resolution, and container name parsing tests
• test(opencode): add config merge and disk-write tests
• test(entrypoint): add debug timestamp and silent-mode tests
• test(workflow): add spinner_visible test, create BuildArgv mount dirs in cellShellHome
• test(cfg): add [asdf] and [claude] section tests
• test(ollama): add FormatActiveTOMLSnippet tests
• chore(go.mod): promote ollama to direct dependency, drop unused blackfriday/go-md2man