fix(skill): point npx source at nottelabs/notte-skills

[giordano-lucas]

Summary

• notte skill add was running npx skills add nottelabs/notte-cli, which clones this repo and searches for SKILL.md files. After the skills/ dir was replaced by the notte-skills submodule (3eca2b3), git clone no longer pulls in skill content — the tool reported No skills found. Pointed it at nottelabs/notte-skills instead (where SKILL.md actually lives).
• Added -f / --upgrade on notte skill add that delegates to npx skills update notte-browser to refresh an installed skill.
• Added a skill-add CI job that builds the CLI, runs notte skill add and notte skill add --upgrade in temp dirs, and asserts .agents/skills/notte-browser/SKILL.md is written — so a future drift in the source URL or skill name fails CI loudly instead of silently saying No skills found.
• Also updated the matching npx skills add ... command in the README.

Test plan

• go build ./... clean
• go test -short ./... passes (including new TestSkillAddUpgradeFlag and TestSkillSourcePointsToSkillsRepo regression guard)
• Local end-to-end: notte skill add in a fresh temp dir installs .agents/skills/notte-browser/SKILL.md
• Local end-to-end: notte skill add --upgrade refreshes the installed skill (✓ Updated notte-browser)
• CI skill-add job passes on this PR

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

This PR fixes a broken notte skill add command by pointing npx skills add at nottelabs/notte-skills (where SKILL.md actually lives) instead of nottelabs/notte-cli (where it was an empty submodule). It also adds a --upgrade/-f flag, a shared runNpx helper, and a new skill-add CI job that performs an end-to-end install assertion to prevent silent regressions.

• Bug fix: skillSource constant and README both updated from nottelabs/notte-cli → nottelabs/notte-skills.
• New feature: --upgrade/-f flag on notte skill add delegates to npx skills update notte-browser to refresh an installed skill.
• Testing: Unit regression guards (TestSkillSourcePointsToSkillsRepo, TestSkillAddUpgradeFlag) and a new CI skill-add job that runs the real notte skill add end-to-end and asserts SKILL.md is written.

Confidence Score: 5/5

Safe to merge — all changes are targeted at the broken npx source URL and are well-covered by new unit and CI end-to-end tests.

The fix is a one-constant change with no side effects on other code paths; the refactored runNpx helper is a straightforward extraction; the new --upgrade flag only activates on explicit opt-in.

No files require special attention.

Important Files Changed

Filename	Overview
internal/cmd/skills.go	Core fix: points npx skills add at nottelabs/notte-skills instead of nottelabs/notte-cli; extracts shared runNpx helper; adds --upgrade/-f flag that delegates to npx skills update notte-browser. Two minor documentation inconsistencies noted.
internal/cmd/skills_test.go	Adds TestSkillAddUpgradeFlag (flag registration guard) and TestSkillSourcePointsToSkillsRepo (regression guard for source URL/skill name); removes stale inline comments.
.github/workflows/ci.yml	New skill-add job: builds CLI, runs notte skill add and notte skill add --upgrade in isolated temp dirs, and asserts SKILL.md is written — catches future source-URL drift.
README.md	Updates the npx skills add example in the README from nottelabs/notte-cli to nottelabs/notte-skills, keeping docs in sync with the code change.

Prompt To Fix All With AI

Fix the following 2 code review issues. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 2
internal/cmd/skills.go:75
The `action` label passed to `runNpx` is always `"skill installation"` regardless of whether `--upgrade` was used. If the upgrade step fails, the error message will read "skill installation failed with exit code …" which would mislead a user who ran `notte skill add --upgrade`.

```suggestion
	action := "skill installation"
	if skillAddUpgrade {
		action = "skill upgrade"
	}
	return runNpx(cmd, action, npxArgs)
```

### Issue 2 of 2
internal/cmd/skills.go:52
The `Long` help text for `skillRemoveCmd` shows `npx skills remove --skill notte-browser` but the actual invocation also appends `-y`. Users reading `--help` output will see an incomplete command if they try to reproduce the behaviour manually.

```suggestion
This command runs: npx skills remove --skill notte-browser -y`,
```

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