Changes touching this path

• three seams that promised a door nobody walked through are settled on the honest half of each choice, and two of the five findings measured FALSE against the tree before anything was touched. revset::select has three production call sites now, not one, so the ticket count is stale - but the doc claim was still false, because cat, diff, blame and archive reach resolve_selector directly and heads resolves the at-sign a third way through working_id and finalized_anchor, so the line today is THE GRAMMAR and not THE SELECTOR, and the gap is written down at the module that makes the claim rather than left to the reader. loot_revset::evaluate over a string is DELETED and evaluate_ast takes the name, deliberately not the other way round: pointing select at the string entry would have left evaluate_ast callerless and parse production-callerless, which is the #1553 shape where a narrowing comes back THROUGH A NEW DOOR. Selection::versions goes with zero callers outside its own unit test, while the ordering half of that same finding is refuted rather than obeyed - the BTreeSet in history is a membership filter for retain_versions and not an order discard, and the topological order is load-bearing at format_patch numbering, range_diff pairing and grep row order, so the guarantee is ANCHORED on the Set variant instead of withdrawn from it. Group::arguments needs no pin for a second tailed group because a second tailed group now FAILS THE BUILD: Args::groups counts tailed groups and asserts in const, every leaf Args being a const, so the case the comment assumed impossible is unrepresentable rather than assumed - proved by a compile_fail doctest with a byte-identical positive control that reddens quoting the assert own message, which is what stops a typo from reading as the rule. build_heads stops taking eight positionals, two adjacent closures and three adjacent optional ids, and takes a named-field HeadSources: the transposition that used to compile silently was RED at 6 passed 1 failed as a mutation, and the same transposition written at the call site afterwards is simply meaningless at 7 passed 0 failed. the run then caught its own new door - HeadSources was born pub with zero out-of-crate callers, exactly the class this ticket is about - so it and build_heads are pub(crate) with the reason recorded at the type. the PATHSPEC comment on the ticket is STALE and nothing moved there: #1493 wired the group to five production leaves and already narrowed the present-tense claim in delta.rs (#1563) 4834a7ce · dbf3dbe6…

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