ci: add custom first-release notes, fall back to auto-generated for future releases

Amp-Thread-ID: https://ampcode.com/threads/T-019cc9da-8040-72f9-ba53-c9ba22443049
Co-authored-by: Amp <amp@ampcode.com>

Author: sinnet3000

.github/workflows/release.yml

@@ -25,7 +25,13 @@ jobs:
         env:
           GH_TOKEN: ${{ github.token }}
         run: |
+          NOTES_FILE=""
+          if [ -f RELEASE_NOTES.md ]; then
+            NOTES_FILE="--notes-file RELEASE_NOTES.md"
+          else
+            NOTES_FILE="--generate-notes"
+          fi
           gh release create "${{ github.ref_name }}" \
             --title "${{ github.ref_name }}" \
-            --generate-notes \
+            $NOTES_FILE \
             bin/*

RELEASE_NOTES.md

@@ -0,0 +1,35 @@
+# First Release
+
+`ip_exit_enum` is a CLI tool that enumerates your public IPv4/IPv6 egress IPs by querying multiple independent HTTP and STUN services concurrently.
+
+It detects non-deterministic outbound behavior — such as load-balanced NAT, carrier-grade NAT, or ISP routing policies — that single-request "what's my IP" tools miss.
+
+## Highlights
+
+- **Multi-protocol discovery** — queries both HTTP echo services and STUN servers
+- **IPv4 & IPv6** — enumerates exit addresses for both IP versions
+- **Confidence scoring** — indicates likelihood of multiple outbound IPs
+- **Live TUI** — real-time progress with per-phase status
+- **Verbose mode** — `-v` flag for detailed per-service diagnostics
+- **Single binary** — no runtime dependencies
+
+## Pre-built Binaries
+
+| Platform | Architecture | Binary |
+|----------|-------------|--------|
+| Linux | amd64 | `ip_exit_enum_linux_amd64` |
+| Linux | arm64 | `ip_exit_enum_linux_arm64` |
+| Linux | arm | `ip_exit_enum_linux_arm` |
+| macOS | Apple Silicon | `ip_exit_enum_darwin_arm64` |
+| macOS | Intel | `ip_exit_enum_darwin_amd64` |
+| Windows | amd64 | `ip_exit_enum_windows_amd64.exe` |
+
+## Usage
+
+```sh
+# Basic
+./ip_exit_enum
+
+# Verbose output
+./ip_exit_enum -v
+```