chore(config): superpowers citers by bare name, routing map, docs, settings

Every superpowers-prefixed skill call in ship-feature, init-project, tour,
deploy, audit-delta, plugin-advisor and lib/analyze-before-plan now names
the vendored skill directly. finishing-a-development-branch is described
as the upstream skill this config does not vendor (gitflow finish is the
integration path). CLAUDE.global.md Skill routing maps the four
non-vendored skills the vendored text still references. settings.json
loses the plugin key and its marketplace block; README, USAGE,
plugin-advisor and the profile skill describe superpowers as vendored
skills, always on, zero plugin cost. CHANGELOG entry with a known
residual.

skills/tour/SKILL.md

@@ -315,9 +315,10 @@ without that approval — neither this repo's nor any target project's.
 
 ## TDD note (skill itself)
 
-Baseline-tested per superpowers:writing-skills (2026-07-04, seeded
-fixture, no skill): the agent branched correctly via gitflow and did not
-merge, BUT (1) silently rewrote the target TODO (checked boxes,
+Baseline-tested per writing-skills (vendored superpowers skill;
+2026-07-04, seeded fixture, no skill): the agent branched correctly via
+gitflow and did not merge, BUT (1) silently rewrote the target TODO (checked
+boxes,
 restructured) during "reconcile"; (2) authored BDR/journal registry
 entries autonomously; (3) ran security as ad-hoc grep + ruff — no
 semgrep, no pinned rulesets; (4) left findings only in its final chat