chore: modernize install.sh with gum UI, spinners, and CI test matrix

[sebslight]

Intent: modernize install.sh UX from noisy/raw output to a clean, guided installer experience, while preserving the same install targets and core flow (npm/git).

• Started from: container/CI runs produced noisy package-manager output and terminal control-sequence clutter; installer messaging was inconsistent (warnings for expected actions)
• Added structured UX: framed header, stage progress bars ([1/3] Preparing, [2/3] Installing, [3/3] Finalizing), clear step statuses, and interactive method chooser when TTY is available
• Added optional gum runtime UX (spinner/log styling) with graceful fallback to plain output when gum is unavailable, disabled, or non-interactive
• Added quiet execution path: apt/dnf/yum/npm output is captured by default and surfaced on failure; --verbose restores full command output
• Flags/vars reference: install.sh supports --gum/--no-gum and OPENCLAW_USE_GUM=auto|1|0 (plus OPENCLAW_GUM_VERSION override); also supports CLAWDBOT_USE_GUM as a compatibility alias
• Added matrix runner + CI workflow: scripts/test-install-matrix.sh and .github/workflows/install-matrix.yml with --mode (dry-run|full), repeatable --image, and default CI behavior set to --no-gum for clean logs

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Project	Deployment	Actions	Updated (UTC)
clawd-bot	Ready	Preview, Comment	Feb 10, 2026 11:42pm
openclaw.ai	Ready	Preview, Comment	Feb 10, 2026 11:42pm