qcap init (#cli-001)

[jvanulde]

Generate key material; show pubkey fingerprint.

[jvanulde]

Status: not implemented. Plan: local key material with Argon2id protection and fingerprint output; config path and key rotation guidance.

[edip-dev-01]

Addressed in fork commit edip-dev-01/q-cap@33659d9: adds qcap init for local identity/key generation and prints a short identity/fingerprint value. Pending upstream merge: edip-dev-01@33659d9

[edip-dev-01]

Closed by merged PR #39: #39