feat: places of every kind

[pacphi]

Why

Work happens outside git repositories too (design: Every place work happens).

In scope

Repository, folder, home, temporary, tool folders and gone; one place per session; the places fixture contract test.

Out of scope

Labels for places (v5, X4).

Acceptance criteria

• Each session lands in exactly one place
• Per-place rows add up to the All work totals for every host

Dependencies

Blocked by: #364

Blocks: #370, #374, #376, #387, #407

Plan

• Release: 4.0.0-beta.3
• Size: size:M · Workstream: ws:project-scope
• Epic: feat: project-scope P6, the dashboard for all work (epic) #301
• Card: P6-03 in the card inventory
• Sources: Design (docs(plans): project-scoped management design and its prerequisites #289) Every place work happens; Making it stick

Verification

• Places contract test