feat(installer): support Termux

[wahh-22]

Closes #1

PR Type

• New feature

Summary

• Add explicit Termux detection to the installer.
• Automatically install missing Termux dependencies with pkg install -y ... before continuing.
• Document that Termux uses the same ./install.sh --all install path.

Changes

File	Change
install.sh	Adds Termux detection, dependency re-checking, automatic pkg installs, and a shell launcher fallback.
README.md	Documents automatic Termux dependency installation.

Test Plan

• bash -n install.sh
• ./install.sh --help
• Real Termux install: ./install.sh --all detected missing jq, ran pkg install -y jq, and completed installation.
• Verified installed tmux scripts with bash -n.
• shellcheck install.sh (not available in the current Termux environment)

Contributor Checklist

• Linked an issue
• Added exactly one type:* label (requires maintainer permissions in upstream)
• Confirmed linked issue has status:approved (requires maintainer permissions in upstream)
• Docs updated for behavior change
• Conventional commit format
• No Co-Authored-By trailers

[Alan-TheGentleman]

Hey Wilmer! Thanks for this — really clean PR. 👏

The Termux detection is solid (three-layered $PREFIX / uname -o / dir check), the non-Termux path is left untouched, and I especially like the #!/bin/sh + exec bash launcher — it funnels every invocation into bash so set -o pipefail can't blow up under dash. Nice touch adjusting the --help sed range too.

One minor robustness nit before merge:

pkg install runs under set -e

The script body runs with set -euo pipefail, so if pkg install exits non-zero (no network, stale repo, etc.) the script dies right there — and the user never sees the friendly re-check message you added below it:

pkg install -y $termux_packages
check_dependencies

Suggested fix

Let the install fail soft so the re-check + friendly hint still runs:

pkg install -y $termux_packages || true
check_dependencies

That way a failed install lands on your ❌ missing required tools message with the pkg install -y ... hint, instead of an abrupt set -e exit.

---

That's the only thing. Apply that and I'll merge. Thanks again for making ./install.sh --all the single happy path across environments — that's exactly the right call.

[wahh-22]

Good catch, fixed in de5986b.

pkg install now fails soft, then the dependency re-check runs and surfaces the friendly missing-tools message with the Termux retry command. I also verified the failure path with a simulated failing pkg, plus bash -n install.sh and ./install.sh --help.