docs: npx skills add installs the full stack, not just caveman

Reword README / LAUNCH-POST to reflect that `npx skills add JuliusBrussee/cavekit`
installs both the three /ck: commands and the two skills together —
it is the primary one-line install path, not a skill-only fallback.
Marketplace and git clone remain as alternatives.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -20,8 +20,7 @@ Kept only what earned its tokens:
 - bug → §B → §V backprop reflex wired into `/ck:build` failure path
 - `/ck:spec from-code` — distill spec from existing codebase
 - `/ck:check` — read-only drift report (replaces five v3 review flavors)
-- standalone `npx skills add JuliusBrussee/cavekit` path for installing
-  the caveman skill alone, no plugin required
+- `npx skills add JuliusBrussee/cavekit` one-line install path (commands + skills)
 
 ### removed (relative to v3.1.0)
 

LAUNCH-POST.md

@@ -102,16 +102,20 @@ your old kits live in git history).
 It is a two-way door. `SPEC.md` is plain markdown. Nothing traps you in
 either direction.
 
-## also: caveman as a standalone skill
+## install
 
-If you just want the compression skill and not the rest:
+One line:
 
 ```bash
 npx skills add JuliusBrussee/cavekit
 ```
 
-One-shot installer. Copies the skill to `~/.claude/skills/caveman/`. No
-plugin, no commands, no opinions about how you work.
+Or via the Claude Code marketplace:
+
+```bash
+/plugin marketplace add juliusbrussee/cavekit
+/plugin install ck@cavekit
+```
 
 ## what I'm not doing
 

README.md

@@ -34,35 +34,29 @@ That's the whole pitch.
 
 ## install
 
-### full plugin (all three commands + both skills)
+One line, via the `skills` CLI — installs commands and skills together:
 
-Marketplace:
+```bash
+npx skills add JuliusBrussee/cavekit
+```
+
+Drops `/ck:spec`, `/ck:build`, `/ck:check` into `~/.claude/commands/` and
+the `caveman` + `backprop` skills into `~/.claude/skills/`. Claude Code
+picks them up on next launch.
+
+Or via the Claude Code marketplace:
 
 ```bash
 /plugin marketplace add juliusbrussee/cavekit
 /plugin install ck@cavekit
 ```
 
-Git:
+Or clone directly:
 
 ```bash
 git clone https://github.com/juliusbrussee/cavekit.git ~/.claude/plugins/cavekit
 ```
 
-Commands become available as `/ck:spec`, `/ck:build`, `/ck:check`.
-
-### caveman skill alone (npx, no plugin)
-
-If you just want the caveman encoding skill (to compress your own prompts
-or specs, outside the cavekit command flow):
-
-```bash
-npx skills add JuliusBrussee/cavekit
-```
-
-One-shot installer. Copies `SKILL.md` to `~/.claude/skills/caveman/`.
-Claude Code picks it up on next launch.
-
 ## format
 
 See [`FORMAT.md`](./FORMAT.md). Fixed sections: §G goal, §C constraints,