docs: plan the contacts implementation

Twelve tasks, TDD throughout, building bottom up: transport, bootstrap
cache, server selection, jCard extraction, querying with the label walk,
the worklist, resolution, the subcommand, an offline proof, two sweeps
and the documentation.

The code in the plan was assembled and run before committing it, against
the plan's own tests, 44 of which pass. That found two defects in the
plan itself: a parameter that shadowed the cache_dir function and forced
a globals() lookup, now renamed to cache_root, and a hand-rolled fake
request in the redirect test that lacked the attributes
HTTPRedirectHandler reads, now a real urllib Request.

Also drops the em dashes from the Documents list in AGENTS.md, which the
no-em-dash writing rule covers and which the contacts entry had matched.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wrfqr2xqQfhtXCscU7zrdz

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