refactor: move all shell scripts to /sh directory (#1843)

Reorganizes the project so all shell scripts live under a dedicated
/sh directory, enabling the OpenRouter rewrite URL to point at /sh/
instead of the repository root.

Moves:
- cli/install.sh → sh/cli/install.sh
- shared/*.sh → sh/shared/*.sh
- {cloud}/{agent}.sh → sh/{cloud}/{agent}.sh (48 scripts)
- {cloud}/README.md → sh/{cloud}/README.md
- e2e/*.sh → sh/e2e/*.sh
- test/macos-compat.sh → sh/test/macos-compat.sh
- test/fixtures/**/*.sh → sh/test/fixtures/**/*.sh

Updates all references:
- RAW_BASE path construction in commands.ts, update-check.ts
- GitHub auth URL in agent-setup.ts
- Self-referencing URLs in install.sh, github-auth.sh
- CI workflow paths in lint.yml, cli-release.yml
- Test file paths in install-script-validation, manifest-integrity
- Documentation in README.md, cli/README.md, CLAUDE.md
- QA scripts in .claude/skills/

Co-authored-by: lab <6723574+louisgv@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

sh/hetzner/opencode.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+set -eo pipefail
+
+_ensure_bun() {
+    if command -v bun &>/dev/null; then return 0; fi
+    curl -fsSL --show-error https://bun.sh/install | bash >/dev/null
+    export PATH="$HOME/.bun/bin:$PATH"
+}
+_ensure_bun
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" 2>/dev/null && pwd)"
+if [[ -n "$SCRIPT_DIR" && -f "$SCRIPT_DIR/../cli/src/hetzner/main.ts" ]]; then
+    exec bun run "$SCRIPT_DIR/../cli/src/hetzner/main.ts" opencode "$@"
+fi
+
+HETZNER_JS=$(mktemp)
+trap 'rm -f "$HETZNER_JS"' EXIT
+curl -fsSL "https://github.com/OpenRouterTeam/spawn/releases/download/hetzner-latest/hetzner.js" -o "$HETZNER_JS"
+exec bun run "$HETZNER_JS" opencode "$@"