Bump cli-compat skills to 0.2.0 (#5324)

## Summary
- Update `cli-compat.json` to point CLI version `1.0.0` at Agent Skills
`0.2.0` (from `0.1.5`).
- The `0.300.0` entry stays at skills `0.1.5` so older CLI binaries keep
resolving to a tag whose manifest format they understand (no
`repo_dir`).

## Why
`databricks-agent-skills` v0.2.0
([release](https://github.com/databricks/databricks-agent-skills/releases/tag/v0.2.0))
introduces the new manifest layout with `repo_dir: "skills"` vs
`repo_dir: "experimental"` per skill (replacing the dropped
`experimental` boolean) and ships 18 experimental skills under
`experimental/`. Until this bump lands, `databricks aitools install
--experimental` resolves to v0.1.5 and finds nothing experimental —
users have to set `DATABRICKS_SKILLS_REF=main` as a workaround.

The CLI installer already understands `repo_dir`
(`SkillMeta.IsExperimental()` in `libs/aitools/installer/installer.go`),
so no code change is needed — only the version pin.

## Test plan
- [x] `go test ./libs/clicompat/... ./libs/aitools/...` — all green
locally.
- [x] Built the CLI from this branch and ran
`DATABRICKS_FORCE_EMBEDDED_COMPAT=true databricks aitools list`:
  - Header: `Available skills (v0.2.0)`.
- 26 skills resolved (8 stable + 18 experimental), matching
`databricks-agent-skills@v0.2.0` `manifest.json`.
- Experimental skills correctly tagged `[experimental]` — confirms
`SkillMeta.IsExperimental()` returns true for entries with `repo_dir ==
"experimental"` in the v2 manifest.
- [x] CI: `go test ./libs/clicompat/...` and `./libs/aitools/...` pass.
Previous Integration Tests failure (run `26372918714`) was unrelated
flake — failing on `TestAccept/bundle/resources/*` and `TestFsCp*` on
`aws-prod-ucws-is`/`gcp-prod-is` runners, none of which read
`cli-compat.json`; same workflow has been flaking on `main`
independently. Re-pushed an empty commit to retrigger.

## Related
- Upstream release:
https://github.com/databricks/databricks-agent-skills/releases/tag/v0.2.0
- v2 manifest at tag:
https://github.com/databricks/databricks-agent-skills/blob/v0.2.0/manifest.json

This pull request and its description were written by Isaac.

Author: jamesbroadhead

internal/build/cli-compat.json

@@ -1,4 +1,4 @@
 {
-  "1.0.0": { "appkit": "0.38.0", "skills": "0.1.5" },
+  "1.0.0": { "appkit": "0.38.0", "skills": "0.2.0" },
   "0.300.0": { "appkit": "0.24.0", "skills": "0.1.5" }
 }