Unify installer: merge install_deps.sh + install.sh into scripts/install.sh

[Justadudeinspace]

Motivation

• Provide a single, hardened, cross-platform installer entrypoint at scripts/install.sh that replaces the previous install.sh and install_deps.sh split.
• Make installation safe, idempotent and debuggable with strict bash flags, traps and a non-interactive default path.
• Support multiple install methods (pipx, uv, local venv, pip --user) and installation --mode choices (pypi|prod|dev) with clear fallbacks.
• Best-effort system dependency provisioning for Termux, proot-distro, Linux distros, macOS and guidance for Windows shells.

Description

• Added scripts/install.sh as the unified installer implementing environment detection helpers (is_termux, is_proot, is_wsl, is_macos, is_windows, distro detection), strict hardening (set -euo pipefail, IFS, trap) and debug support via --debug.
• Implemented install methods and switches: prefers pipx, falls back to uv, supports --venv (local .venv), --pip-user, --mode <pypi|prod|dev>, and optional --prefix; also added --dry-run to print planned actions.
• Best-effort system package installs implemented for Termux (pkg install python3 ...), Debian/Ubuntu (apt-get package set), Fedora/RHEL (dnf), Arch (pacman), and macOS (Homebrew guidance); includes a proot-vs-Termux prefix warning to avoid prefix hijack.
• Removed the old top-level install.sh and install_deps.sh, updated README.md and documentation to reference scripts/install.sh, pinned curl/wget bootstrap snippets to v3.0.0 tag, and ensured scripts/install.sh is executable (chmod +x scripts/install.sh).

Testing

• Ran a syntax check with bash -n scripts/install.sh which completed successfully.
• Executed a dry-run smoke test ./scripts/install.sh --dry-run which printed a detected environment summary and planned install method (output shown during rollout).
• Attempted shellcheck scripts/install.sh but shellcheck was not available in the environment (not executed).
• Verified repository docs and CI/usage snippets were updated to call scripts/install.sh and curl/wget lines were updated to the v3.0.0 tag.

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Codex Task

[Justadudeinspace]

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