Remove the unlock guidance and em-dashes; bump to 0.6.3

[vvillait88]

Summary

The unlock command and its plaintext passphrase cache were removed (the CLI now reads the passphrase only from AGENTSCORE_PAY_PASSPHRASE or an interactive prompt), but three surfaces still described it:

• agent-guide output, which agents read as instructions, still had a step telling them to run agentscore-pay unlock --for 1h and unlock --clear, a command that no longer exists. The step now says to supply the passphrase through AGENTSCORE_PAY_PASSPHRASE from a secret store.
• README: the commands table, the "Unlocking the keystore" table and the passphrase-strength section still listed unlock and ~/.agentscore/.unlock. All now describe the env var and the prompt only.
• tests/integration/README.md: Tempo testnet funding said "contact Tempo team" where fund --chain tempo --network testnet mints directly, and it listed a future test that does not exist.

Also removes every em-dash from user-facing CLI strings (--help, agent-guide, error messages) and the repo's docs; a spaced em-dash became a comma.

Version 0.6.3, since the shipped agent-guide output changes. Found in a docs audit of every repo, by checking the README's command table against the CLI's own --llms manifest.

Type of change

• Bug fix (no breaking change)
• New feature (no breaking change)
• Breaking change (existing callers must update)
• Docs, tests, or internal maintenance only

Public API

None. CLI output text only; no command, flag or exit code changes.

Test plan

bun run lint, bun run typecheck, bun run knip, bun run test (578 passed, 2 skipped) and bun run build all exit 0. No unlock reference remains outside the purge helper and the tests that pin its removal.

Checklist

• Tests cover the new behavior, and the suite passes locally
• Lint, format, and type checks pass
• Docs and README examples updated if the public surface changed
• No secrets, credentials, or personal data in the diff or the tests