Fix install.sh version parsing with minified JSON (#62)

## Summary
- Fix `get_latest_version()` in `scripts/install.sh` extracting the
wrong JSON field when the GitHub API returns minified (single-line) JSON
- The `grep | cut` pipeline matched the entire JSON line and extracted
the `"url"` value instead of `"tag_name"`, producing a nonsensical
download URL
- Use `grep -o` to extract only the `"tag_name":"..."` substring before
passing to `cut`, which works regardless of JSON formatting

Fixes #61

## Test plan
- [ ] Run `curl -fsSL
https://api.github.com/repos/wesm/agentsview/releases/latest | grep -o
'"tag_name"[[:space:]]*:[[:space:]]*"[^"]*"' | head -1 | cut -d'"' -f4`
and verify it returns the tag (e.g. `v0.8.0`)
- [ ] Pipe minified single-line JSON through the same pipeline and
verify correct extraction
- [ ] Run `curl -fsSL https://agentsview.io/install.sh | bash` after
merge and verify successful install

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: wesm

scripts/install.sh

@@ -55,11 +55,18 @@ download() {
 
 get_latest_version() {
     local url="https://api.github.com/repos/${REPO}/releases/latest"
+    local json
     if command -v curl &>/dev/null; then
-        curl -fsSL "$url" | grep '"tag_name"' | head -1 | cut -d'"' -f4
+        json=$(curl -fsSL "$url")
     elif command -v wget &>/dev/null; then
-        wget -qO- "$url" | grep '"tag_name"' | head -1 | cut -d'"' -f4
+        json=$(wget -qO- "$url")
+    else
+        return 1
     fi
+    echo "$json" \
+        | grep -o '"tag_name"[[:space:]]*:[[:space:]]*"[^"]*"' \
+        | head -1 \
+        | cut -d'"' -f4
 }
 
 verify_checksum() {

scripts/install_test.sh

@@ -0,0 +1,60 @@
+#!/bin/bash
+# Tests for install.sh version parsing logic
+set -euo pipefail
+
+PASS=0
+FAIL=0
+
+assert_eq() {
+    local desc="$1" expected="$2" actual="$3"
+    if [ "$expected" = "$actual" ]; then
+        echo "  PASS: $desc"
+        PASS=$((PASS + 1))
+    else
+        echo "  FAIL: $desc"
+        echo "    expected: '$expected'"
+        echo "    actual:   '$actual'"
+        FAIL=$((FAIL + 1))
+    fi
+}
+
+parse_tag_name() {
+    echo "$1" \
+        | grep -o '"tag_name"[[:space:]]*:[[:space:]]*"[^"]*"' \
+        | head -1 \
+        | cut -d'"' -f4
+}
+
+echo "=== get_latest_version parsing ==="
+
+# Pretty-printed JSON (typical curl response)
+PRETTY='{
+  "url": "https://api.github.com/repos/wesm/agentsview/releases/291105519",
+  "tag_name": "v0.8.0",
+  "name": "v0.8.0"
+}'
+assert_eq "pretty-printed JSON" "v0.8.0" "$(parse_tag_name "$PRETTY")"
+
+# Minified JSON (the case that caused #61)
+MINIFIED='{"url":"https://api.github.com/repos/wesm/agentsview/releases/291105519","assets_url":"https://api.github.com/repos/wesm/agentsview/releases/291105519/assets","tag_name":"v0.8.0","name":"v0.8.0"}'
+assert_eq "minified JSON" "v0.8.0" "$(parse_tag_name "$MINIFIED")"
+
+# tag_name before url field
+REORDERED='{"tag_name":"v1.2.3","url":"https://api.github.com/repos/wesm/agentsview/releases/1"}'
+assert_eq "tag_name before url" "v1.2.3" "$(parse_tag_name "$REORDERED")"
+
+# Extra whitespace around colon
+SPACED='{  "tag_name" :  "v2.0.0"  }'
+assert_eq "extra whitespace" "v2.0.0" "$(parse_tag_name "$SPACED")"
+
+# Pre-release version
+PRERELEASE='{"tag_name":"v0.9.0-rc1","name":"v0.9.0-rc1"}'
+assert_eq "pre-release version" "v0.9.0-rc1" "$(parse_tag_name "$PRERELEASE")"
+
+# No tag_name field (API error / rate limit)
+NO_TAG='{"message":"API rate limit exceeded"}'
+assert_eq "missing tag_name returns empty" "" "$(parse_tag_name "$NO_TAG")"
+
+echo
+echo "Results: $PASS passed, $FAIL failed"
+[ "$FAIL" -eq 0 ]