Build recall, project_get and project_store v2 #316

Entry and project tools from #309.

Work

• recall: today's memory_recall (#215 behaviour kept), plus guide: true returning the system guide.
• project_get without projectId: short list of accessible projects. With it: project data, the caller's permissions, assignees with immutable references and no email addresses, counts of open tasks, memories, pages and pending proposals.
• project_store: create and update with a fields object and the same patch rule as item_store.

Done (9424170)

src/Conderis/Services/Items/ProjectTools.cs (not registered until #317), RecallText and PublicName; tests in ProjectToolsTests; the three tools are in BuiltV2ToolsMatchTheMeasuredSchemas.

• Recall is composed by RecallText, shared by memory_recall and recall; only the tool names in its hints differ (task_list/item_search/system_memory today, item_list/recall guide=true in v2). includeUpstream is gone: v2 always includes a fork's public upstream knowledge. recall guide=true returns today's guide; #317 rewrites it for v2.
• project_get returns permissions as a list of read, write, moderate, own. A test stores a shared memory as contributor (proposed) and as owner (published), matching what project_get announced. Visitors without membership get no task counts, assignees or proposal counts.
• project_store creates with name (required), description, remote, upstreamProjectId, organizationId, and changes name, description, remote; null clears description or remote, a null name and the fields fixed at creation are refused.
• No email addresses in v2 responses. People have no display name, only their sign-in address, and the services name them by it. The v2 tools shorten any name that is an address to the part before the @ (assignees, creators, history authors, proposal authors and reviewers, list entries); the reference identifies a person. A proper display name per user is a separate decision.

The old tools keep today's names and addresses until #317 removes them.