docs(plan): revise the higgsfield plan and spec after the three-lens challenge

docs/superpowers/plans/2026-09-30-higgsfield-pack.patches/01-gitignore.patch

@@ -1,26 +1,27 @@
 --- a/.gitignore
 +++ b/.gitignore
-@@ -101,6 +101,12 @@
+@@ -101,6 +101,11 @@
  # membership, so the pack can gain a skill with no edit here.
  skills/21st-*
  
 +# Higgsfield skill pack symlinks — created on demand by toggle-external.sh
 +# (`enable higgsfield` / `enable higgsfield-websites`). The pack is OFF by
-+# default and in no profile, so these usually don't exist. A glob: the
-+# upstream repo owns the membership.
++# default and in no profile, so these usually don't exist.
 +skills/higgsfield-*
 +
  # Context7 docs-lookup skill — installed by `ctx7 setup --claude --cli`
  # (install-plugins.sh Step 6, when absent) into ~/.claude/skills (a symlink to
  # this repo's skills/). ctx7-managed and re-created on demand — not vendored here.
-@@ -236,6 +242,11 @@
+@@ -236,6 +241,13 @@
  # layout and the content is sha256-verified against 21st.dev's manifest.
  skills-external/21st-*/
  
 +# Higgsfield skill pack — machine-owned: a git clone of higgsfield-ai/skills,
 +# staged by lib/higgsfield-skills.sh (install-plugins.sh Step 8.6) and moved
 +# here, refreshed by update-all.sh. Not vendored: it tracks upstream main.
++# The second line is the helper's stage, left behind only by a killed run.
 +skills-external/higgsfield-*/
++skills-external/.higgsfield-stage.*/
 +
  # npx `skills add` project-scope artifacts — darwin-skill copies itself into
  # the repo's .agents/ and writes skills-lock.json at root. Our own agents live