v0.1.0-alpha.51

• Tool docs now live at /tools.html, with execution, durable-effects, deferred-completion, and output-budgeting guidance split into /tools-execution.html.
• Docs navigation now separates embedding, tools, plugins, operations, examples, architecture, and reference, with the Pagefind search index regenerated.
• Remote protocol coverage now includes process DTOs plus broader trigger/process conversion and schema tests for host service boundaries.
• Agent workbench coverage now exercises trigger persistence and reopened-session tool catalog behavior.

Full Changelog: v0.1.0-alpha.50...v0.1.0-alpha.51