docs(docs): clarify skills sync workflow in documentation

docs/chezmoi/data.mdx

@@ -9,6 +9,7 @@ Files in `.chezmoidata/` are merged into chezmoi's template data on every run. N
 | --- | --- | --- |
 | `.chezmoidata/packages.yaml` | `.packages` | [`run_onchange_before_10-packages.sh.tmpl`](/chezmoi/scripts#10-packages), [`run_onchange_after_20-gh-extensions.sh.tmpl`](/chezmoi/scripts#20-gh-extensions) |
 | `.chezmoidata/aliases.yaml` | `.aliases` | `dot_config/shell/aliases.sh.tmpl` (bash and zsh) |
+| `.chezmoidata/skills.yaml` | `.skills` | [`run_onchange_after_25-skills.sh.tmpl`](/chezmoi/scripts#25-skills) |
 
 ## packages.yaml [#packagesyaml]
 
@@ -187,3 +188,7 @@ Every other YAML alias (`e`, `e.v`, `hx`, `cdc`, `cdk`, `cdl`, `cds`, `cdw`, and
 :::tip
 To add an alias for every shell, add it to `aliases.yaml` for bash/zsh and to `20-aliases.fish` by hand for fish.
 :::
+
+## skills.yaml [#skillsyaml]
+
+Declares the agent skills installed by the Skills CLI. `skills.cli` is the pinned CLI (`skills@1.7.0`, run with `npx -y`), `skills.agents` the default install targets (`[universal, claude-code]`), and `skills.sources` a list of `{ source, skills, agents? }` entries: 110 skills across 42 entries. The full list, pinned sources, and add/remove workflow are on the [Skills](/ai/skills) page.