Melange CLI/MCP v0.5.0

Changelog

• 20253dd Improve image display in README.md
• 7c1e7f9 Merge pull request #11 from zetic-ai/feat/oauth-primary-login
• d1d7702 Revise installation instructions in README.md
• 3e3b5bf feat(auth): OAuth as primary auth login with PAT fallback
• c2eb3a1 feat(mcp): add Title to every tool for connector directories
• 205b31a feat: add Melange CLI logo to README
• 5fa3826 fix(auth): 3 must-fixes + coverage for OAuth primary login
• df12c46 fix(auth): harden OAuth credential lifecycle
• 4dab146 fix(ci): docs regen and race-safe flow_test buffers
• b585de1 fix(install): tolerate workflow_dispatch signature for v0.4.0
• cb9183f fix(lint): gofmt mcp Tool fields (Name align) + coverage and smoke for OAuth primary login
• 8370e7b fix(oauth): close ln before re-binding same port on invalid_target retry
• ffabe6c fix(oauth): handle bare host without scheme in normalizeHost
• e25f433 fix(oauth): stabilize loopback race with httptest and fresh port
• 3fad8c4 fix(test): make oauth loopback tests robust under -race
• 8a18f35 fix(test): make outer invalid_target retry test robust on macos
• d608056 fix(test): windows ConfigDir variants for save_extra_test