bench: 5R battery — closes ticket #000021 (15-sub-battery suite complete)

Phase 2 of #000021. React/Rearrange/Restore/Replicate/Resonate over
the workspace surface — selfmodel_records (#000014) + memory_records
(#000017), both landed earlier today. Closes the gap that gated 5R
since the substrate work shipped.

Sub-battery semantics (per SQD whitepaper §9.3 + ticket #000021 §4.2):

- React: incorporate new fact/constraint. Workspace = (snapshot_t0,
  snapshot_t1, expected_delta). Pass = added_facts present + removed_facts
  absent in t+1.
- Rearrange: restructure without semantic shift. Re-canonicalize
  different surface forms through a named π*; pass = bytes match
  expected_equivalent flag. Tests the order-invariance contracts in
  SelfModel (capability_claim_hashes sorted) and Memory (branches
  sorted by branch_id).
- Restore: retrieve prior fact. Workspace = (history[], current_facts[]).
  Pass = fact in current OR any historical snapshot.
- Replicate: independent canonical encodings via π*. Same input run
  N times must yield byte-equal output. Tests determinism contract.
- Resonate: variance across N runs. Deterministic π*'s yield
  distinct=1; expected_max_distinct=1 enforces zero-variance contract.

Surface:

- bench/batteries/b_5r.py (5 deterministic runners; no LLM-as-judge)
- bench/fixtures/5r/{react,rearrange,restore,replicate,resonate}-v1.jsonl
  (30 each = 150 new fixtures)
- runner.py registers 5r in _BATTERIES + _DEFAULT_FIXTURES
- Makefile: bench-5r + bench-suite (5S+5T+5F+5R aggregate)

Final tally:
  5S  syntax/semantics/syllogism/synthesis/semiotics       108
  5T  transfer/transfer-learning/triangulation/...          154
  5F  function/finetuning/falsification/...                  50
  5R  react/rearrange/restore/replicate/resonate            150
  TOTAL: 462 fixtures across 21 sub-batteries — 100% pass.

Tests: 6 new in tests/test_bench_batteries.py + adjustment to
test_session_integration.py for the 312→462 count + 5R sub-battery
presence assertion. Full suite: 1192 passed, 36 skipped.

Closes #000021. Phase 3 (external-corpus expansion) remains open
under the ticket but does not gate closure — the complete
Dav1DPrometheus surface is now executable infrastructure.

docs/TICKETS.md

@@ -65,7 +65,7 @@ Newest first. Update on every open/close.
 | #000024  | 5T Phase 1b + Dav1DPrometheus vocabulary alignment | closed · landed 2026-05-08 | 2026-05-07 | —         |
 | #000023  | 5S Phase 1b: Syllogism · Synthesis · Semiotics | closed · landed 2026-05-08 | 2026-05-07 | —         |
 | #000022  | Adapter LossReport (PRD I9 analogue)           | closed · landed 2026-05-07 | 2026-05-07 | —         |
-| #000021  | 5S/5T/5R benchmark fixtures + harness          | in progress · Phase 1a landed 2026-05-07 | 2026-05-07 | —         |
+| #000021  | 5S/5T/5R benchmark fixtures + harness          | closed · Phase 1a + 2 landed 2026-05-08 | 2026-05-07 | —         |
 | #000020  | Capital-cost ledger (8-capital queues)         | closed · landed 2026-05-07 | 2026-05-07 | —         |
 | #000019  | Specification methodology for π* and V         | closed · landed 2026-05-07 | 2026-05-07 | —         |
 | #000018  | Adversarial soft-hash covert-channel analysis  | open · awaiting go/no-go | 2026-05-07 | —         |