Add nightly support to install.sh

[gtrrz-victor]

Summary

This PR adds nightly installation support to scripts/install.sh, aligns Homebrew stable and nightly documentation around cask installs, updates version-check notifications so the suggested upgrade command matches the detected install manager and release channel, and documents the new release-channel options in the README.

What Changed

• Added --channel stable|nightly to scripts/install.sh
• Defaulted install.sh to the latest stable release
• Added latest-nightly resolution in install.sh for --channel nightly
• Updated version-check update hints to infer the right command from binary location plus version channel
• Aligned Homebrew stable upgrade guidance to use brew upgrade --cask entire
• Aligned README Homebrew install commands so both stable and nightly use cask installs
• Added Scoop detection and stable update hints for Windows installs
• Restored mise detection so existing mise installs still get mise upgrade entire
• Added tests covering brew stable, brew nightly, scoop, mise, and curl-installer fallback behavior
• Added a follow-up plan doc for installer-owned provenance and future auto-update support

Update Commands Shown By Version Check

These are the update commands the CLI can now display when a newer version is available:

• Homebrew stable: brew upgrade --cask entire
• Homebrew nightly: brew upgrade --cask entire@nightly
• Script stable: curl -fsSL https://entire.io/install.sh | bash
• Script nightly: curl -fsSL https://entire.io/install.sh | bash -s -- --channel nightly
• Scoop stable: scoop update entire/cli
• Mise: mise upgrade entire

Intentionally Deferred

This PR does not add install.json or installer-owned provenance yet.

That work is deferred to a follow-up so this PR stays focused on the low-friction path:

• latest stable / latest nightly installation via install.sh
• correct upgrade hints based on binary detection

The follow-up plan is documented in docs/install-provenance-plan.md.

Verification

• bash -n scripts/install.sh
• go test ./cmd/entire/cli/versioncheck
• mise run test

[Copilot]

Pull request overview

Adds a “nightly” release channel to the curl-based installer and updates the CLI’s update instructions to account for nightly vs stable installs, aligning future work around install provenance.

Changes:

• Add --channel stable|nightly support to scripts/install.sh and implement nightly version resolution via GitHub releases.
• Update version-check update instructions to use nightly-aware commands (e.g., brew upgrade --cask entire@nightly, and curl installer with --channel nightly fallback).
• Add a planning doc for installer-owned provenance and auto-update.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
scripts/install.sh	Adds channel selection and nightly version fetching for the installer.
docs/install-provenance-plan.md	Documents the intended provenance + auto-update approach for follow-up work.
cmd/entire/cli/versioncheck/versioncheck.go	Makes update instructions channel-aware and adds Scoop/Homebrew cask handling.
cmd/entire/cli/versioncheck/versioncheck_test.go	Updates tests for the new update-command behavior and new channels/managers.

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

Bugbot Autofix prepared a fix for the issue found in the latest run.

• ✅ Fixed: Nightly grep failure causes silent script exit
  • Added || true to the nightly tag extraction pipeline so grep no-match no longer aborts under set -euo pipefail and the intended empty-version error path runs.

Or push these changes by commenting:

@cursor push fab33146c7

Preview (fab33146c7)

diff --git a/scripts/install.sh b/scripts/install.sh
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -107,7 +107,7 @@
 get_latest_nightly_version() {
     local url="https://api.github.com/repos/${GITHUB_REPO}/releases?per_page=20"
     local version
-    version=$(fetch_github_json "$url" | grep '"tag_name"' | grep 'nightly' | head -n 1 | sed -E 's/.*"tag_name": *"v?([^"]+)".*/\1/')
+    version=$(fetch_github_json "$url" | grep '"tag_name"' | grep 'nightly' | head -n 1 | sed -E 's/.*"tag_name": *"v?([^"]+)".*/\1/' || true)
 
     if [[ -z "$version" ]]; then
         error "Failed to fetch latest nightly version from GitHub. Please check your internet connection."

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