research: shard-spectrum synthesis v3 (folds SHARD-WP-0003 batch)

Extends the capability model to the nine WP-0003 engines (~23 systems total).
Per-shard spectra 13 -> 14 (adds provenance granularity); refines merge-model
(+fork/journal-replay, +coexist-with-rank), attachment-mode (+git-IS-store,
+container, +direct-DB, +REST/file-store-hybrid, +external-API payload-format
facet), native-query (+SPARQL/RDF far-end), history (+DB-rows, +partial),
structure (+typed-graph, +inline-embedded objects), content-opacity
(+lossy-exportable), write-granularity (+story-item, +section-anchor).

Headline: new federation-model taxonomy (S2.5) -- federation is plural
(fork+journal / VCS-replication+ping / query-time graph join / feed
aggregation / activity streams / engine-mirror), a selectable/composable
coordination-layer axis feeding SHARD-WP-0002 T1-T6. Folds UC-68-82 into the
workplan; no new UCs, no INTENT boundary change.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.claude/ralph-loop.local.md

@@ -1,21 +0,0 @@
----
-active: true
-iteration: 2
-session_id: b24b53ca-a25b-4a18-8331-925c4100d39f
-max_iterations: 20
-completion_promise: "HEUREKA"
-workplan_id: SHARD-WP-0003
-workplan_file: workplans/SHARD-WP-0003-engine-dives-batch.md
-started_at: "2026-06-14T16:37:36Z"
----
-
-Read the workplan at `workplans/SHARD-WP-0003-engine-dives-batch.md`.
-
-If every task has `status: done` AND frontmatter `status: done`:
-run `rm -f .claude/ralph-loop.local.md` first (deactivates the loop so the stop hook exits cleanly),
-then output <promise>HEUREKA</promise>.
-
-Otherwise implement the next `todo` task as described in the workplan.
-Set task `in_progress` when starting, `done` when complete.
-When all tasks are done set frontmatter `status: done`.
-