Projects: classes as entities, and the sidebar fits short windows

A project is a class with facts (description, status, kind, party,
dates, links, notes) in one project.set event behind the format
feature projects. Four tools (books.add_project, update_project,
projects, project); documents and decisions link to projects; B-37:
on-spec costs are expensed as incurred, repayment is revenue, and the
unrecovered cost is never below zero (Kani). Viewer: a Projects list
and a project page with its figures, by month and by account. The
sidebar measures its footer instead of reserving a fixed 172 px.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01T3gXMVt7XJPi6ens1or9Dj

README.md

@@ -100,7 +100,7 @@ just          # lists the recipes: check, build, prove, demo, ...
 ```
 crates/ledger-core/    # engine: money, accounts, journal, ledger, reports
 crates/ledger-store/   # journal + SQLite projection + blob store
-crates/ledger-mcp/     # MCP server: 115 tools, resources, handbook, receipt policy
+crates/ledger-mcp/     # MCP server: 119 tools, resources, handbook, receipt policy
 crates/ledger-import/  # QBO CSV import, IIF/XLSX export
 crates/ledger-config/  # wanderbooks.toml company settings
 crates/ledger-cli/     # `wanderbooks`: the one executable (every mode)