Sync skills with harbor upstream (2026-05-10)

[benediktstroebl]

Syncs two skills with upstream changes from the last 48 hours.

harbor-cli

--retry-exclude now replaces config values instead of merging (#1622, src/harbor/cli/jobs.py)

Before the fix, passing --retry-exclude on the command line would be merged with retry.exclude_exceptions from a config file. After the fix, the CLI flag completely replaces the config value. Updated the "Common Gotchas" section in SKILL.md and the retry-exclude note in references/flags.md to reflect this.

harbor-task-creator

reward.json now takes priority over reward.txt (#1620, src/harbor/verifier/verifier.py)

The verifier previously checked reward.txt first; it now checks reward.json first. The skill had the priority backwards in two places — the runtime model step 6 and the reward contract bullet in the test.sh section. Both corrected.

No changes

• harbor-adapter-creator: no relevant upstream changes.

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