fix(deploy-to-vercel, vercel-cli-with-tokens): wait with `inspect --wait` instead of polling

Problem

After a deploy, both skills give agents a way to check status but no way to wait:

• The git-push flow says sleep 5 and then take the latest entry of vercel ls --format json. If the deployment isn't registered yet, the latest entry is an older deployment, and agents retry with more sleeps.
• The --no-wait flows only offer a one-shot vercel inspect <url>. When the user wants the build result, agents end up in sleep + vercel inspect loops, which waste turns and run for an unpredictable time.

Change

• Git push: find the pushed commit's deployment directly: vercel ls <project-name> --meta githubCommitSha=$(git rev-parse HEAD) --format json → .deployments[0].url. The skill notes that it can take a few seconds to appear, and gives the GitLab and Bitbucket keys (gitlabCommitSha, bitbucketCommitSha).
• Waiting: wherever the skills say "check status with vercel inspect <url>", they now also give the blocking form: vercel inspect <url> --wait --timeout 20m. It returns when the build finishes and exits 1 on ERROR, CANCELED or timeout. The default --timeout is 3m, which is too short for most real builds, so the skill recommends a longer one. On failure, read the logs with vercel inspect <url> --logs.
• --no-wait stays, so the URL still comes back fast.
• skills/deploy-to-vercel.zip and skills/vercel-cli-with-tokens.zip are rebuilt to match.

Verification

• Checked the flags in vercel inspect --help and vercel ls --help on CLI 65.8.0 (--wait, --timeout, --logs, --meta).
• Checked the exit codes in the CLI source: timedOut ? 1 : exitCode(readyState), where exitCode returns 1 for ERROR/CANCELED.
• Ran vercel ls <project> --meta githubCommitSha=<sha> --format json on a real GitHub-connected project. It returned exactly that commit's deployment.
• Ran vercel inspect <url> --wait --timeout 20m on a real deployment. It blocked until the build was READY.
• node scripts/build-discovery-index.mjs https://example.com/skills passes (9 skills).

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