docs: add the system widgets implementation plan

Eleven tasks. The palette's warning role first, since everything else
colours against it; then an offscreen render harness, so each later task
can look at its work without an install-restart-toggle cycle; then
parsers, samplers, primitives, the four cards, and the live pass.

Glyphs are taken from the old conky config and re-rendered rather than
guessed. That matters: a guess at the Slackware mark drew a stomach, and
the config had the real codepoint (U+F318) all along, along with the
disk and network-share icons. The icon is the label now, so no mount
name is drawn.

The two NFS shares are told apart by their server's address, read from
the mount's device field at runtime. The repo is public, so the address
belongs on screen and not in a committed file; deriving it also means
the card survives a renumbered LAN. df_parse keeps the device field for
this, and `host` is non-nil exactly for a network mount.

Two traps recorded because both would fail silently: df is aliased to
df -h in the user's shell, so the sampler calls /usr/bin/df -P -B1 by
absolute path or the parser reads '1.6G' where it expects bytes; and the
per-core counters must outlive a frame, since load is a delta and a
counter rebuilt each draw reports nil forever.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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