### Motivation
- Prevent newly-created skills from being placed in unexpected locations
by prompting for an install path and defaulting to a discoverable
location so skills are usable immediately.
- Make the `skill-creator` instructions explicit about the recommended
default (`~/.codex/skills` / `$CODEX_HOME/skills`) so the agent and
users follow a consistent, discoverable convention.
### Description
- Updated `codex-rs/skills/src/assets/samples/skill-creator/SKILL.md` to
add a user prompt: "Where should I create this skill? If you do not have
a preference, I will place it in ~/.codex/skills so Codex can discover
it automatically.".
- Added guidance before running `init_skill.py` that if the user does
not specify a location, the agent should default to `~/.codex/skills`
(equivalently `$CODEX_HOME/skills`) for auto-discovery.
- Updated the `init_skill.py` examples in the same `SKILL.md` to use
`~/.codex/skills` as the recommended default while keeping one custom
path example.
### Testing
- Ran `cargo test -p codex-skills` and the crate's unit test suite
passed (`1 passed; 0 failed`).
- Verified relevant discovery behavior in code by checking
`codex-rs/utils/home-dir/src/lib.rs` (`find_codex_home` defaults to
`~/.codex`) and `codex-rs/core/src/skills/loader.rs` (user skill roots
include `$CODEX_HOME/skills`).
------
[Codex
Task](https://chatgpt.com/codex/tasks/task_i_69b75a50bb008322a278e55eb0ddccd6)
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