Tower v0.3.1

What's Changed

• feat(workbench): ship the durable gateway architecture by @jp-liu in #24
• fix(mcp): harden explicit gateway task continuation by @jp-liu in #25
• refactor(workbench): establish event module boundaries by @jp-liu in #26
• fix(mcp): restore CI workflow startup by @jp-liu in #27
• feat(settings): integrate extension platform foundation by @jp-liu in #28
• feat(workbench): observe operational data lifecycle by @jp-liu in #29
• refactor(mcp): scope tool catalogs by runtime role by @jp-liu in #30
• refactor(mcp): isolate unattended goal and gateway recovery by @jp-liu in #31
• feat(mcp): complete unattended capability runtime by @jp-liu in #32
• fix(release): install Playwright browser in publish workflow by @jp-liu in #33

Full Changelog: v0.3.0...v0.3.1