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A skill_file row whose path is the skill's own SKILL.md (persisted by older builds or direct create/update API calls) collides with the primary content the daemon writes itself, failing task prep with errPathPreExists on every non-codex local runtime (#3489). #3526 guarded this with strings.EqualFold(path, "SKILL.md") at the daemon write site and the three API ingress points, but the stored path is not canonicalized: "./SKILL.md" or "sub/../SKILL.md" slip past the exact-match guard while filepath.Join still resolves them onto the same SKILL.md, so prep can still break. Extract one canonical helper, skill.IsReservedContentPath, that cleans the path before the case-insensitive compare, and use it at all four sites (execenv writeSkillFiles, skill create, update, single-file upsert). Add a daemon-side regression test for writeSkillFiles ignoring a bundled SKILL.md (exact + "./" spellings) — the load-bearing fix previously had only API-layer coverage — plus a unit test for the helper. Existing poisoned rows are intentionally left in place (skipped at prep) per the decision on MUL-2928. MUL-2928 Follow-up to #3526; supersedes #3560. Co-authored-by: J <j@multica.ai> Co-authored-by: multica-agent <github@multica.ai>