v1.91.328.0 ship-queue: screen only when the selector restores every case; unscreened PRs fill train seats (GSTA-165 1a) (#3619)

* Narrow screens leave hub files to the train gate; map size-ledger baselines and the careful mask awk

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* fix: pre-landing review fixes (pull_request runs stay broad, deleted hubs, READY and summary previews)

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* docs: CHANGELOG for narrow screens (Unreleased)

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* docs: TESTING_INTERNALS describes narrow and broad PR screen policy

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* chore: record test-pr-profile.ts as non-behavioral at HARNESS_VERSION 6

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* ship-queue: screen only when the selector restores every case; unscreened PRs fill train seats (GSTA-165 1a)

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* test: pin the diffs that still screen (unselectable, skill template + bun.lock)

Two assertions in test/ship-queue-train-logic.test.ts: a diff the paid
selector cannot select recommends --screen with the full gate selection,
and a diff that mixes a skill template with bun.lock recommends --screen.
GSTA-165 1a, from /ship Steps 7-8.

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* docs: CHANGELOG tests and deferrals; P1 TODOs for GSTA-165 follow-ups

CHANGELOG [Unreleased]: name the two added tests and list the deferred
CREW.md rule 22 text and train-record attribution field. TODOS.md: both
deferrals as P1 under Ship.

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---------

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docs/ship-policy.md

@@ -414,9 +414,12 @@ gstack-ship-queue ready --pr 42 --screen [--broad] # dispatches one paid screen
 ```
 
 Without a choice it prints the `SCREEN:` selection (with
-`screen_selection: gstack-paid`, the skill's own cases and `recommend
---screen` or `--no-screen`: `--screen` when the screen selects a skill's own
-cases) and refuses with `READY_SCREEN_CHOICE_REQUIRED`. The price line says
+`screen_selection: gstack-paid`, the skill's own cases, the selector's mode and
+`recommend --screen` or `--no-screen`: `--screen` only when the selector's
+mode is `full-fallback`, an unknown dependency or a shared runtime input that
+restores every case, or when it cannot select at all; every other PR rides
+unscreened, and the train gate's full census runs its cases on the tree that
+merges) and refuses with `READY_SCREEN_CHOICE_REQUIRED`. The price line says
 the dollar figure is pending the cost replay; until it lands, `SCREEN:` shows
 case counts and the recommendation only. A lane that already ran focused
 local cases says so in the READY block and may pass `--no-screen`. `--screen`
@@ -466,8 +469,8 @@ gstack-ship-queue train build --prs 41@<sha>,42@<sha>,43@<sha>
 ```
 
 It prints `ORDER:` (the slot order to announce: screened PRs first in READY
-order, then unscreened; when `max_size` or more unscreened PRs wait they form
-their own train and `HELD:` lists them; `--order <pr>,<pr>,...` naming every
+order, then unscreened PRs fill the remaining seats, and `HELD:` lists the PRs
+over `max_size`; `--order <pr>,<pr>,...` naming every
 pinned PR once replaces that rule, for a PR that must merge before another,
 and the train's later `NEXT:` rebuilds keep it), one `PREFIX: T<i> <commit>
 tree=<tree>` per prefix and one `SLOT:` per PR. `--dry-run` adds the