"You need a passphrase to unlock the secret key"

Having just joined keybase and encrypted my first test message:

```
$ keybase encrypt -m "This is a secret message" joelteon > message
$ keybase decrypt message -o message.txt

You need a passphrase to unlock the secret key for
user: "keybase.io/joelteon "
2048-bit RSA key, ID 5C168495C8328D1E, created 2014-11-04
(subkey on main key ID 4FB87AFD575DFF5D)

warn: [GNUPG:] ENC_TO 5C168495C8328D1E 1 0
warn: [GNUPG:] USERID_HINT 5C168495C8328D1E keybase.io/joelteon
warn: [GNUPG:] NEED_PASSPHRASE 5C168495C8328D1E 4FB87AFD575DFF5D 1 0
warn: gpg: cancelled by user
warn: [GNUPG:] MISSING_PASSPHRASE
warn: gpg: encrypted with 2048-bit RSA key, ID 5C168495C8328D1E, created 2014-11-04
warn: "keybase.io/joelteon "
warn: gpg: public key decryption failed: Operation cancelled
warn: [GNUPG:] ERROR pkdecrypt_failed 99
warn: [GNUPG:] BEGIN_DECRYPTION
warn: [GNUPG:] DECRYPTION_FAILED
warn: gpg: decryption failed: No secret key
warn: [GNUPG:] END_DECRYPTION
error: `gpg` exited with code 2
```

Start by reproducing the documented `keybase encrypt` and `keybase decrypt` commands and inspect how the client invokes GPG during decryption. The issue does not identify a source file or test; done should mean determining why the secret key is unavailable or unexpectedly prompts for a passphrase and confirming the command's decryption behavior.

Written by the indexing model from the issue text.