v0.9.4

Documentation

• README: Added send shortcut, doctor command, self-DM behavior docs, and updated required scopes
• SKILL.md: Documented self-DM via bot behavior
• docs/commands.md: Added send shortcut and doctor command reference, self-DM behavior
• docs/getting-started.md: Added doctor verification step, uses send shortcut
• docs/ai-agents.md: Added agent mode (SLACKBUZZ_AGENT=1) and diagnostics sections
• docs/security.md: Updated required scopes, noted separate bot/user identity storage

Tests

• TestLooksLikeUser — validates DM target detection for @NAMEs, user IDs, channel IDs
• TestIsMissingScopeError — validates missing_scope error detection (direct, wrapped, contained)
• TestFormatResolveError — validates actionable error messages for channel resolution failures
• TestFormatSendError — validates context-aware error messages for DM vs channel send failures
• TestAuthConfigRoundTrip — validates bot/user identity fields persist through save/load
• TestAuthConfigClear — validates all fields cleared including bot identity
• TestAuthConfigBotAndUserSeparate — validates bot and user info don't overwrite each other in auth.yml