status/uninstall/install document the settings.py config fallback as keyed on source=, so a partial config leaves the model inventing a port

[amiddavid]

Raised out of the round-1 review of #222, which fixed this wording in skills/keepalive/SKILL.md only. The other three skills carry the same defect, and it is pre-existing on main rather than introduced by that PR, so it gets its own issue per the repo's rule about unrelated defects.

The defect

settings.py config prints an option_<name>= line only for keys actually present in pluginConfigs[…].options, and reports source=(none) only when the whole options object is missing or empty (scripts/settings.py:570-575).

All four skills document the fallback as though it were keyed on source=:

File	Line	Text
skills/status/SKILL.md	23	Use its `option_port=`, or 8787 if it reports `source=(none)`.
skills/uninstall/SKILL.md	27	Use its `option_port=`, or 8787 if it reports `source=(none)`.
skills/install/SKILL.md	108-109	option_port=… / option_preset=… — use these + source=(none) — nothing configured; the plugin.json defaults apply

So a user with a partial config — the common case, e.g. --config preset=house with the port left alone — gets a real source= and no option_port= line. The documented fallback does not apply, because source= is not (none), and there is no value to use either. The model is left to invent one at exactly the point these sections warn is dangerous.

For uninstall that is the worse outcome: it builds the removal URL from the port, so an invented port matches nothing and the removal silently finds nothing to remove — the failure mode #221 was about, reached by a different route.

Fix

Make the fallback per-option rather than keyed on source=, as #222 now does for keepalive:

Any option the output does not list is unconfigured — use the plugin.json default for that one (port 8787, preset cache), whatever source= says.

Worth considering a test that asserts the partial-config shape, since all four instances were written from the same incorrect mental model and a fifth skill would inherit it. TestTheConfiguredPortCanActuallyBeHonoured currently only exercises the both-keys-present case.