chore(skills): optimize updating and updating-checksums reference docs

.claude/skills/quality-scan/SKILL.md

@@ -476,4 +476,4 @@ Apply these socket-cli conventions when scanning and fixing:
 
 See `reference.md` @reference for complete agent prompts and pattern definitions.
 
-**Version**: 1.1.0 (2026-03-24) | Compatible with socket-cli 3.0.0+ | Includes zizmor integration
+**Version**: 1.1.0 (2026-03-24)

.claude/skills/quality-scan/reference.md

@@ -959,4 +959,4 @@ All findings follow this structure:
 
 ---
 
-**Version**: 1.1.0 (2026-03-24) | Compatible with socket-cli 3.0.0+ | Includes zizmor integration
+**Version**: 1.1.0 (2026-03-24)

.claude/skills/updating-checksums/SKILL.md

@@ -84,7 +84,7 @@ node packages/cli/scripts/sync-checksums.mjs
 <validation>
 **Expected Output:**
 ```
-Syncing checksums for 7 GitHub release tool(s)...
+Syncing checksums for 6 GitHub release tool(s)...
 
 [opengrep] opengrep/opengrep @ v1.16.0
   Found checksums.txt, downloading...

.claude/skills/updating-checksums/reference.md

@@ -0,0 +1,280 @@
+# updating-checksums Reference Documentation
+
+This document provides detailed information about external tool checksums, the sync script, and troubleshooting for the updating-checksums skill.
+
+## Table of Contents
+
+1. [External Tools Inventory](#external-tools-inventory)
+2. [Checksum Sync Script](#checksum-sync-script)
+3. [GitHub Release Tools](#github-release-tools)
+4. [Checksum Formats](#checksum-formats)
+5. [Edge Cases](#edge-cases)
+6. [Troubleshooting](#troubleshooting)
+
+---
+
+## External Tools Inventory
+
+### GitHub Release Tools (synced by this skill)
+
+| Tool | Repository | Release Tag Format | Has checksums.txt |
+|------|------------|-------------------|-------------------|
+| opengrep | opengrep/opengrep | `v*.*.*` | Yes |
+| python | astral-sh/python-build-standalone | `*.*.*` | No (computed) |
+| socket-patch | SocketDev/socket-patch | `v*.*.*` | Varies |
+| sfw | SocketDev/sfw-free | `v*.*.*` | Varies |
+| trivy | aquasecurity/trivy | `v*.*.*` | Yes |
+| trufflehog | trufflesecurity/trufflehog | `v*.*.*` | Yes |
+
+### Non-GitHub Tools (NOT synced by this skill)
+
+| Tool | Type | Integrity Method |
+|------|------|-----------------|
+| @coana-tech/cli | npm | SRI integrity hash |
+| @cyclonedx/cdxgen | npm | SRI integrity hash |
+| synp | npm | SRI integrity hash |
+| socketsecurity | pypi | SRI integrity hash |
+| socket-basics | github-source | None |
+
+---
+
+## Checksum Sync Script
+
+### Location
+
+`packages/cli/scripts/sync-checksums.mjs`
+
+### How It Works
+
+1. Reads `packages/cli/external-tools.json`
+2. Filters tools with `type: "github-release"`
+3. For each tool:
+   a. Fetches the GitHub release by tag
+   b. Looks for `checksums.txt` asset
+   c. If found: parses SHA-256 hashes from checksums.txt
+   d. If not found: downloads each release asset and computes SHA-256 via `crypto.createHash('sha256')`
+4. Compares new checksums with existing
+5. Writes updated checksums to external-tools.json
+
+### Command Reference
+
+```bash
+# Sync all GitHub release tools
+node packages/cli/scripts/sync-checksums.mjs
+
+# Sync specific tool only
+node packages/cli/scripts/sync-checksums.mjs --tool=opengrep
+
+# Preview changes without writing
+node packages/cli/scripts/sync-checksums.mjs --dry-run
+
+# Force update even if unchanged
+node packages/cli/scripts/sync-checksums.mjs --force
+```
+
+### Expected Output
+
+```
+Syncing checksums for N GitHub release tool(s)...
+
+[opengrep] opengrep/opengrep @ v1.16.0
+  Found checksums.txt, downloading...
+  Parsed 5 checksums from checksums.txt
+  Updated: 2 checksums, Unchanged: 3 checksums
+
+[trivy] aquasecurity/trivy @ v0.58.2
+  Found checksums.txt, downloading...
+  Parsed 12 checksums from checksums.txt
+  Unchanged: 12 checksums
+
+Summary: X updated, Y unchanged
+```
+
+---
+
+## GitHub Release Tools
+
+### Release Asset Patterns
+
+Each tool has specific asset naming conventions:
+
+**opengrep:**
+- `opengrep-core_linux_aarch64.tar.gz`
+- `opengrep-core_linux_x86.tar.gz`
+- `opengrep-core_osx_aarch64.tar.gz`
+- `opengrep-core_osx_x86.tar.gz`
+- `opengrep-core_windows_x86.zip`
+- Includes `checksums.txt`
+
+**python (python-build-standalone):**
+- `cpython-{version}+{buildTag}-{target}-{config}.tar.zst`
+- No checksums.txt — hashes computed by downloading each asset
+
+**socket-patch:**
+- `socket-patch-aarch64-apple-darwin.tar.gz`
+- `socket-patch-x86_64-apple-darwin.tar.gz`
+- `socket-patch-aarch64-unknown-linux-gnu.tar.gz`
+- `socket-patch-x86_64-unknown-linux-musl.tar.gz`
+- `socket-patch-aarch64-pc-windows-msvc.zip`
+- `socket-patch-x86_64-pc-windows-msvc.zip`
+
+**sfw (sfw-free):**
+- `sfw-free-linux-arm64`
+- `sfw-free-linux-x86_64`
+- `sfw-free-macos-arm64`
+- `sfw-free-macos-x86_64`
+- `sfw-free-musl-linux-arm64`
+- `sfw-free-musl-linux-x86_64`
+- `sfw-free-windows-x86_64.exe`
+
+**trivy:**
+- `trivy_{version}_Linux-64bit.tar.gz`
+- `trivy_{version}_Linux-ARM64.tar.gz`
+- `trivy_{version}_macOS-64bit.tar.gz`
+- `trivy_{version}_macOS-ARM64.tar.gz`
+- `trivy_{version}_windows-64bit.zip`
+- Includes `trivy_{version}_checksums.txt`
+
+**trufflehog:**
+- `trufflehog_{version}_linux_amd64.tar.gz`
+- `trufflehog_{version}_linux_arm64.tar.gz`
+- `trufflehog_{version}_darwin_amd64.tar.gz`
+- `trufflehog_{version}_darwin_arm64.tar.gz`
+- `trufflehog_{version}_windows_amd64.tar.gz`
+- `trufflehog_{version}_windows_arm64.tar.gz`
+- Includes checksums in release
+
+### Checksum Storage Format
+
+In `external-tools.json`, checksums are stored as:
+
+```json
+{
+  "checksums": {
+    "asset-filename.tar.gz": "hex-encoded-sha256-hash",
+    "asset-filename-2.tar.gz": "hex-encoded-sha256-hash"
+  }
+}
+```
+
+---
+
+## Checksum Formats
+
+### checksums.txt Format
+
+Standard format used by most tools:
+
+```
+sha256hash  filename
+sha256hash  filename
+```
+
+- Two or more spaces between hash and filename
+- SHA-256 hex-encoded (64 characters)
+- One entry per line
+
+### Computed Checksums
+
+When no checksums.txt is available:
+
+```javascript
+// Script computes SHA-256 by streaming the downloaded file
+const hash = crypto.createHash('sha256')
+const stream = fs.createReadStream(filePath)
+stream.pipe(hash)
+// Result: hex-encoded SHA-256
+```
+
+---
+
+## Edge Cases
+
+### Tool with Dual Configuration (sfw)
+
+The `sfw` tool has both a GitHub release binary (`SocketDev/sfw-free`) and an npm package (`sfw` on npmjs.com). Both are tracked in the same `external-tools.json` entry via `type: "github-release"` for the binary checksums and `npmPackage`/`npmVersion` fields for the npm component. The checksums skill only handles the GitHub release binary checksums; the npm package version is updated separately via `pnpm run update`.
+
+### python-build-standalone
+
+This tool has no checksums.txt in releases. The sync script must:
+1. Download each release asset
+2. Compute SHA-256 locally
+3. This is significantly slower than parsing checksums.txt
+
+### Version Tag Variations
+
+Different tools use different tag formats:
+- Most use `v{version}` (e.g., `v1.16.0`)
+- python-build-standalone uses bare version (e.g., `3.11.14`)
+- The `githubRelease` field in external-tools.json stores the exact tag
+
+### Stale Checksums After Version Bump
+
+If someone updates a tool version in external-tools.json but forgets to sync checksums:
+- SEA builds will fail integrity verification
+- Always run checksum sync after any version change
+
+---
+
+## Troubleshooting
+
+### GitHub API Rate Limiting
+
+**Symptom:** Script fails with 403 or rate limit error.
+
+**Solution:**
+```bash
+# Check current rate limit
+gh api rate_limit --jq '.rate'
+
+# Ensure authenticated
+gh auth status
+```
+
+Authenticated requests get 5,000 requests/hour vs 60 for unauthenticated.
+
+### Release Not Found
+
+**Symptom:** Script reports release not found for a tool.
+
+**Cause:** The `githubRelease` tag in external-tools.json doesn't match any release.
+
+**Solution:**
+```bash
+# Verify release exists
+gh release view <tag> --repo <owner/repo>
+
+# List recent releases
+gh release list --repo <owner/repo> --limit 5
+```
+
+### Checksum Mismatch After Update
+
+**Symptom:** Checksums changed but tool version didn't.
+
+**Cause:** Release assets were re-uploaded (some projects rebuild releases).
+
+**Solution:** This is expected in rare cases. Review the diff to ensure it's a legitimate update, then commit.
+
+### JSON Validation Failure
+
+**Symptom:** Updated external-tools.json is invalid JSON.
+
+**Solution:**
+```bash
+# Validate JSON
+node -e "JSON.parse(require('fs').readFileSync('packages/cli/external-tools.json'))"
+
+# If corrupted, restore and retry
+git checkout packages/cli/external-tools.json
+node packages/cli/scripts/sync-checksums.mjs
+```
+
+### Large Downloads Timeout
+
+**Symptom:** python-build-standalone sync times out (large assets).
+
+**Solution:**
+- Sync specific tool: `--tool=python`
+- Ensure stable network connection
+- The script handles retries for individual assets