Create an evlog map Rule (or Framework Adapter)

Extend the coverage scanner in @evlog/cli. Two kinds of extension:

• A rule: a new question asked of every entry point (packages/cli/src/lib/map/rules/). This is the common case.
• A framework adapter: teach evlog map to find entry points in a new framework (packages/cli/src/lib/map/adapters/). Rarer and heavier; see the last section.

PR Title

feat(cli): add the {id} map rule

The cli scope already exists, so no scope registration is needed.

Requirement or opportunity? Decide first

This is the design decision everything else follows from (see apps/docs/content/3.cli/3.rules.md for the published contract):