fix: prefix skill names with olostep- to avoid conflicts

[ZeeshanAdilButt]

Summary

• Skill names in SKILL.md frontmatter were bare (search, scrape, map, etc.) — when users have multiple skill providers installed (e.g. ours + another tool's skill pack), the agent sees name conflicts and can't disambiguate
• Prefixed all 13 skill name: fields with olostep-: search → olostep-search, scrape → olostep-scrape, etc.
• Updated runInstall filter logic to normalize both sides so --skill search and --skill olostep-search both work (backward compat preserved)
• Installed folder names were already olostep-<name> — this change makes the frontmatter name: field consistent with the folder name

Affected skills

olostep-answers, olostep-batch, olostep-crawl, olostep-debug-error, olostep-docs-to-code, olostep-extract-schema, olostep-integrate, olostep-map, olostep-migrate-code, olostep-research, olostep-scrape, olostep-search, olostep-setup

Test plan

• npm test — all 193 tests pass
• olostep add skills --skill search still works after the change
• olostep add skills --skill olostep-search also works
• After olostep skills update, agent no longer shows skill name conflicts

[ZeeshanAdilButt]

consolidating into single PR