Verdict GO, with one mandatory constraint.
Phase 0 HOLDS: the customer-facing path set is fully derivable from data the
controller already parses (ParseComposeClassifiableBinds), and
ValidateBackupSpec's refusal set already covers the path-safety class
data_paths: needs -- so the annotation-only design introduces no new
filesystem-write primitive. No catalog folder is reachable only via env
indirection; zero templates use long `type: bind` syntax.
Found off-brief: the derivation is ALREADY LIVE at deploy time
(stacks/manager.go:183 ensureUserdataMounts, "the deploy belt"), proven by a
clean two-box control -- media/podcasts exists on demo-felhom where
audiobookshelf is deployed, not on demo-hp, and is in no skeleton.
P0 GO: derived set 14 dirs vs hardcoded 14 (+media/podcasts, -documents); all
three hand-verified anchors match. P1 GO: 4 sources incl. nested + accented
names all index ready. P2 GO: deep-link template constructible in Go from
(sourceName, relPath) alone; login redirect preserves the target. P3 GO for the
feature, with a pre-existing setgid-chain break recorded. P4 GO: userdata/import
is shareable, guard unchanged, no live share created. P5: before-state inventory
captured read-only on both boxes. P6 GO-conditional: the naive derivation
produced 20 distinct outputs from 20 identical runs -- a guaranteed FileBrowser
force-recreate loop -- fixed by one sort. P7: 12 sources safe server-side.
No production code, no version bump, no live mutation.
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