Cannot inject - operation not permitted (MacOS)

Using MacOS Tahoe 26.6.2 (latest).
Upon update to v1.0.0 it showed multiple "cannot verify it's free of malware" prompts, and even after allowing it through Privacy & Security it's still showing an error when injecting.

```
🛠 Preparing BetterDiscord...
✅ Directory exists: /Users/choccy/Library/Application Support/BetterDiscord/data
✅ Directory exists: /Users/choccy/Library/Application Support/BetterDiscord/plugins
✅ Directory exists: /Users/choccy/Library/Application Support/BetterDiscord/themes
✅ BetterDiscord prepared for install

📥 Downloading BetterDiscord...
✅ Downloaded BetterDiscord version v1.14.0 from the official website
✅ BetterDiscord downloaded

✅ Discord is not running.

🔌 Injecting into Discord...
❌ Cannot write to /Applications/Discord.app/Contents/Resources
open /Applications/Discord.app/Contents/Resources/.bd-write-probe-351104156: operation not permitted
Error: installation failed: open /Applications/Discord.app/Contents/Resources/.bd-write-probe-351104156: operation not permitted
```

Here's what I got when I uninstalled and reinstalled:

```
==> Installing Cask bdcli
==> Linking Binary 'bdcli' to '/opt/homebrew/bin/bdcli'
Warning: An exception occurred within a child process:
RuntimeError: Failed to generate bash completions from /opt/homebrew/Caskroom/bdcli/1.0.0/bdcli: Failure while executing; `\{\"SHELL\"\ =\>\ \"bash\"\} /opt/homebrew/Caskroom/bdcli/1.0.0/bdcli completion completion bash` was terminated by uncaught signal KILL. Here's the output:

Failed to generate zsh completions from /opt/homebrew/Caskroom/bdcli/1.0.0/bdcli: Failure while executing; `\{\"SHELL\"\ =\>\ \"zsh\"\} /opt/homebrew/Caskroom/bdcli/1.0.0/bdcli completion completion zsh` was terminated by uncaught signal KILL. Here's the output:

Failed to generate fish completions from /opt/homebrew/Caskroom/bdcli/1.0.0/bdcli: Failure while executing; `\{\"SHELL\"\ =\>\ \"fish\"\} /opt/homebrew/Caskroom/bdcli/1.0.0/bdcli completion completion fish` exited with 1. Here's the output:

Failed to generate pwsh completions from /opt/homebrew/Caskroom/bdcli/1.0.0/bdcli: Failure while executing; `\{\"SHELL\"\ =\>\ \"pwsh\"\} /opt/homebrew/Caskroom/bdcli/1.0.0/bdcli completion completion powershell` exited with 1. Here's the output:

```

Then got these two password prompts twice (4x total):
"git-credential-osxkeychain wants to use your confidential information stored in "github.com" in your keychain."
"git-credential-oskeychain wants to access key "github.com" in your keychain."
Allowing all of them and running `bdcli install --channel stable` leads to the first "operation not permitted" error.

When trying the installer app, I get the same result as [this issue from the installer repo](https://github.com/BetterDiscord/Installer/issues/424).

Start by reproducing `bdcli install --channel stable` on macOS Tahoe and capture the failure while writing to `/Applications/Discord.app/Contents/Resources`. Compare the CLI behavior with the linked Installer issue; done means identifying the cause of the permission failure and confirming that installation succeeds without the reported error.

Written by the indexing model from the issue text.