fix: harden macOS signing flow

apps/macos/README.md

@@ -0,0 +1,64 @@
+# Clawdbot macOS app (dev + signing)
+
+## Quick dev run
+
+```bash
+# from repo root
+scripts/restart-mac.sh
+```
+
+Options:
+
+```bash
+scripts/restart-mac.sh --no-sign   # fastest dev; ad-hoc signing (TCC permissions do not stick)
+scripts/restart-mac.sh --sign      # force code signing (requires cert)
+```
+
+## Packaging flow
+
+```bash
+scripts/package-mac-app.sh
+```
+
+Creates `dist/Clawdbot.app` and signs it via `scripts/codesign-mac-app.sh`.
+
+## Signing behavior
+
+Auto-selects identity (first match):
+1) Developer ID Application
+2) Apple Distribution
+3) Apple Development
+4) first available identity
+
+If none found:
+- errors by default
+- set `ALLOW_ADHOC_SIGNING=1` or `SIGN_IDENTITY="-"` to ad-hoc sign
+
+## Team ID audit (Sparkle mismatch guard)
+
+After signing, we read the app bundle Team ID and compare every Mach-O inside the app.
+If any embedded binary has a different Team ID, signing fails.
+
+Skip the audit:
+```bash
+SKIP_TEAM_ID_CHECK=1 scripts/package-mac-app.sh
+```
+
+## Library validation workaround (dev only)
+
+If Sparkle Team ID mismatch blocks loading (common with Apple Development certs), opt in:
+
+```bash
+DISABLE_LIBRARY_VALIDATION=1 scripts/package-mac-app.sh
+```
+
+This adds `com.apple.security.cs.disable-library-validation` to app entitlements.
+Use for local dev only; keep off for release builds.
+
+## Useful env flags
+
+- `SIGN_IDENTITY="Apple Development: Your Name (TEAMID)"`
+- `ALLOW_ADHOC_SIGNING=1` (ad-hoc, TCC permissions do not persist)
+- `CODESIGN_TIMESTAMP=off` (offline debug)
+- `DISABLE_LIBRARY_VALIDATION=1` (dev-only Sparkle workaround)
+- `SKIP_TEAM_ID_CHECK=1` (bypass audit)