docs(pipeline): register Track MP in roadmap + milestones freeze exception

Roadmap gains the Track MP phase table (MP0 in progress, MP1-MP5 ahead);
milestones doc records the side track + the explicit user-authorized
freeze exception (MP may reopen frozen streaming/WB-rendering subsystems
under its own gated phases only); CLAUDE.md Current state gets the
one-line pointer.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

CLAUDE.md

@@ -116,7 +116,8 @@ note in the milestones doc): **D.2b retail UI** (next: container-switching —
 `claude-memory/project_d2b_retail_ui.md`). The **R5 movement-manager arc is DONE**
 (2026-07-05, V5 facade shipped; close-out banner in
 `docs/research/2026-07-03-r5-managers/r5-wiring-handoff.md`; carried: #167, R6/TS-42).
-M2 (CombatMath) deferred. Keep this paragraph ≤6 lines + pointers — detail in the docs
+**Track MP** (modern-pipeline perf side track, dedicated sessions only — roadmap
+"Track MP") is at MP0. M2 (CombatMath) deferred. Keep this paragraph ≤6 lines + pointers — detail in the docs
 below, NOT here.
 
 For canonical state, read in this order:

docs/plans/2026-04-11-roadmap.md

@@ -1180,6 +1180,27 @@ port in any phase — no separate listing here.
 
 ---
 
+### Track MP — Modern Pipeline (performance side track; user-commissioned 2026-07-05)
+
+**Spec:** `docs/superpowers/specs/2026-07-05-modern-pipeline-design.md` (the
+umbrella design — read it first). **Goal:** smoothness first (no frame over
+~16 ms during any traversal), then 300+ FPS sustained in dense towns.
+Perf-only per `feedback_render_perf_not_faithfulness_gated` — pixels and
+game-feel stay identical; the simulation's retail-mirroring OO structure is
+untouched. NOT part of M1.5 — runs in dedicated side-track sessions; M1.5
+critical path wins every conflict.
+
+| Phase | What | Status |
+|---|---|---|
+| MP0 | Honest frame profiler (`[frame-prof]`) + baseline capture | 🔵 IN PROGRESS — code shipped 2026-07-05 (plan `docs/superpowers/plans/2026-07-05-mp0-frame-profiler.md`); baseline capture pending |
+| MP1 | Baked asset pak (`acdream-bake` CLI + mmap zero-copy `PakReader`) | ⚪ next after the MP0 gate |
+| MP2 | Retail distance-degrade port, hide-only cut (retires a divergence row) | ⚪ |
+| MP3 | Arch ECS render world + delta submission (the 300-FPS lever) | ⚪ |
+| MP4 | Zero-alloc frame loop + flat physics data | ⚪ hard-queued behind M1.5 #137 |
+| MP5 | Job-system parallelism | ⚪ stretch, evidence-gated |
+
+---
+
 ## Cross-cutting work tracked in parallel
 
 - **Test coverage.** Each phase lands with unit + integration tests in `tests/`. Current count: 98 Core + 96 Core.Net = 194. Keep the ratio as new phases land.

docs/plans/2026-05-12-milestones.md

@@ -245,6 +245,20 @@ which the operating rules have always allowed; declaring them milestones
 would manufacture scope where a tactical ledger (ISSUES + handoffs)
 already carries them.
 
+**Modern Pipeline side track (Track MP — user-commissioned 2026-07-05; NOT
+a milestone, NOT part of M1.5).** A performance modernization arc (baked
+asset pipeline → retail distance-degrade → ECS render world with delta
+submission → zero-alloc frame loop) targeting smoothness first, then 300+
+FPS in dense towns. Spec:
+`docs/superpowers/specs/2026-07-05-modern-pipeline-design.md`; phase table
+in the roadmap ("Track MP"). **Freeze exception (explicit, user-authorized
+2026-07-05):** this track may reopen the otherwise-frozen streaming and
+WB-rendering subsystems — but only under its own gated phases (pixel- and
+feel-identical conformance gates, legacy path deleted at each gate), never
+as ad-hoc rework. Rule 2's freeze still binds all NON-MP work. MP runs in
+dedicated side-track sessions; the M1.5 critical path wins every conflict,
+and MP4 is hard-queued behind #137.
+
 **Still OPEN in M1.5 — dungeon support (Phase G.3, issue #133).** Dungeons
 don't work: the streaming/load/render/physics pipeline was built entirely
 around outdoor landblocks (terrain + scattered buildings) and has no path