radar: abstraction-radar scout briefing + seeded backlog (dynamic discovery, AHA-gated, read-only)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

plans/abstractions.md

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+# Abstraction Radar — backlog
+
+Maintained by the read-only `radar` loop (see `plans/agent-briefings/radar-loop.md`).
+Detection only — implementation is a separate, coordinated step owned by the
+relevant subsystem loop, never by radar.
+
+**AHA gate to reach _Proposed_:** ≥3 real consumers · all past Phase 2 & API-stable ·
+structurally identical (file:line evidence) · a natural home (usually NOT lib/guest).
+Anything short → _Watching_ (what's missing) or _Rejected_ (why).
+
+---
+
+## Last scan
+
+- **Date:** 2026-06-06 (seed, by hand at radar setup)
+- **Subsystem set discovered:** loop worktrees `acl, feed, flow, mod, search,
+  persist, fed-prims, fed-sx-m, erlang, go, ruby, sx-vm-extensions, radar`; main-repo
+  subsystems incl. merged `feed` + language substrates (`apl, haskell, prolog,
+  datalog, lua, …`). Actively looping (tmux): `acl, feed, flow, mod, search,
+  persist, fed-sx-m1` (+ radar).
+- Re-enumerate every pass; new loops (e.g. a future `commerce`/`identity`) auto-join.
+
+---
+
+## Proposed (cleared the gate)
+
+### A1 · Adopt the shared conformance driver across subsystems
+- **Pattern:** every subsystem hand-rolls a near-identical `conformance.sh`
+  (epoch-load → eval → scoreboard emit) and an inline `<x>-test name got expected`
+  pass/fail counter.
+- **Consumers (≥3, overwhelming):** 15 `lib/*/conformance.sh` — `apl, feed, datalog,
+  flow, mod, lua, erlang, forth, go, common-lisp, haskell, js, ocaml, prolog,
+  smalltalk, tcl`.
+- **Home:** `lib/guest` — the one legitimate exception (the shared driver
+  `lib/guest/conformance.sh` + `lib/guest/conformance.sx` already exist; modes
+  `dict` and `counters`).
+- **Status: IN PROGRESS.** Existing adopters: `prolog` (dict), `haskell` (counters).
+  **`apl` migrated 2026-06-06** (commit on architecture) — and the migration
+  *surfaced a latent bug*: the old awk extractor under-counted `pipeline` (40 vs the
+  real 152 assertions); true apl total is **562**, not 450. Evidence that adopting
+  the driver also improves correctness.
+- **Action:** each remaining subsystem's OWN loop migrates when quiescent — add a
+  `conformance.conf` (+ a `test-harness.sx` preload defining its counters) and
+  replace `conformance.sh` with the 1-line exec shim
+  (`exec bash …/guest/conformance.sh …/conformance.conf "$@"`). Recipe template:
+  `lib/haskell/conformance.conf` (counters) or `lib/prolog/conformance.conf` (dict).
+  Keep the `bash lib/X/conformance.sh` entry point so no loop is disrupted.
+- **Priority: HIGH** (15 consumers, low risk, interface-preserving, additive).
+
+---
+
+## Watching (real but not yet through the gate)
+
+### W1 · Federation scaffold (merge / ingest / backfill / trust-gate)
+- Every subsystem's Phase 4 is "federation" with the same shape (cross-instance,
+  trust-gated, injected transport). feed has `feed/merge|ingest|inbound|backfill`.
+- **Missing:** only feed is past its federation phase; mod/search/acl/persist haven't
+  built theirs yet. Re-check once ≥3 have shipped Phase 4.
+- **Home when ripe:** `fed-sx` (NOT lib/guest).
+
+### W2 · Per-viewer visibility / permission filter
+- feed has `feed/visible` + injected `permit?`; search and mod will post-filter per
+  viewer too.
+- **Missing:** <3 shipped consumers; and the right move is *delegate to `acl-on-sx`*,
+  not extract. Re-check when search + mod have their ACL filters.
+
+### W3 · Collection helpers (group-by, dedupe-by-key, stable top-N, distinct-order)
+- feed built all of these on APL primitives. search/commerce/events will want
+  group-by / top-N.
+- **Missing:** ≥3 stable consumers; and these likely belong in the **substrate**
+  (APL/Haskell already expose grade/sort/unique) rather than a shared lib. Watch.
+
+### W4 · In-memory store fakes → `persist-on-sx`
+- Not an abstraction to extract — a migration target. Every subsystem fakes its
+  store with a mutable list (`feed/-log`, flow store, mod audit, …).
+- **Owner:** `persist-on-sx` (in progress). Tracked there, listed here for visibility.
+
+---
+
+## Rejected (considered, declined — do not re-propose)
+
+- **"Continuous auto-implementing abstractor loop."** Rejected at design time: an
+  agent writing across `lib/<x>/**` breaks the worktree isolation that makes the
+  fleet safe, and is rewarded for manufacturing premature/wrong abstractions. The
+  radar is read-only by design. (This file is the alternative.)
+- **Dumping app-domain plumbing into `lib/guest`.** Rejected: `lib/guest` is for
+  language-implementation plumbing. App patterns route to acl/fed-sx/persist/
+  substrate/host instead (see the routing rule in the briefing).