URI tickets: branch/commit naming

Tickets that unify Beagle's branch-vs-commit-hash disambiguation behind one keeper-owned, branch-first, hash-length-agnostic rule (origin in DIS-025, grammar in URI-spec). Each entry below is one ticket with its live state; an entry drops off once the whole ticket closes. The fix-and-land method is Issues.

Active tickets

URI-001 (unify branch/commit naming: St.1 branch-first + St.2 length-agnostic full-sha + St.3 scope-only canonical form + St.4-5 retire-guessers/remote-delegation) DONE — all 5 stages landed/confirmed. Topic closed.