D322: log issue #87 long-session audio degradation + ship GE_D322 pool-telemetry probe

User report (v0.3.0 full campaign): audio progressively degrades from Silo;
by Caverns/Cradle the OST is inaudible and SFX come and go; restarting the
game restores it. Logged as D322 with static triage: level teardown audit
clean, mixer stateless per frame, D202's covered leak class is one shape
only (ownerless count==-1 loops) validated single-level only, and D305
already records a pool/list accounting desync. Ranked hypotheses:
voice-pool exhaustion/counter drift > queue starvation > evtq saturation.

Probe: GE_D322=1 prints sfx=n/8 (SFX soft cap), evtq=n/64, pv free/lame/alloc
(24 physical synth voices) + pipeline depth/drops every 5 s of wall clock,
read with GE_D204. sndD322PoolSummary() walks the ALSynth lists under the
D285 lock; NB drvr is a pointer field (first build faulted on &drvr).
Smoke-tested 40 s headless -level_09: pools coherent, no crash.

Also adds the missing D321 row to the findings index (entry existed at file
tail with no table row, so it was absent from the CSV too).

docs/dev/GE-ENV-PROBES.md

@@ -3,7 +3,7 @@
 Every `getenv("GE_…")` in the tree. The table prose is hand-curated;
 **`tools_pc/gen_env_probes.py`** re-greps the live sites and reports drift
 (NEW / GONE vars + a fresh file:line map) — run it before trusting the
-File:line cells. Last reconciled 2026-09-20 (v0.3.0 release review). All are **env-gated**: unset = zero behavior
+File:line cells. Last reconciled 2026-09-21 (D322 probe added; v0.3.0 release review was 2026-09-20). All are **env-gated**: unset = zero behavior
 change, so they are safe to leave in a release build (they only cost a
 `getenv` on the guarded path). "Dead" below means *the finding it was built
 for is closed* — the probe is strip-candidate scaffolding, not that it does
@@ -110,6 +110,7 @@ Two classes:
 | `GE_RSEED` | `port/src/random.c:134` (`#ifdef PORT`) | Test-only boot-seed override: `GE_RSEED=<hex64>` pins `g_randomSeed` at first seed instead of the wall-clock-derived value — for determinism and N64-parity tests. Inert unset. | **live, test-only** |
 | `GE_RSEED_LV` | `port/src/d318watchdog.c:232` (`#ifdef PORT`) | One-shot level-start seed log: logs `g_randomSeed` at the first tick after level start (optionally armed for a specific tick via `<hex>@<tick>`) — ties a saved/loaded game's PRNG state to a level for D318-class repro. Inert unset. | **live** (D318 verification) |
 | `GE_D318T` | `port/src/d318watchdog.c:270` (`#ifdef PORT`) | D318 watchdog timeline probe: per-tick log of the Facility ai_22 softlock signature window (c78 list/offset/attack state, c67 health) while the watchdog watches. Inert unset. | **live** (D318 verification) |
+| `GE_D322` | `port/src/audio.c` (`audioSetNextBuffer`), `src/snd.c` (`sndD322PoolSummary`) | D322 pool-telemetry probe: one line per 5 s of wall clock with the three pool layers a long session can exhaust — `sfx=count/max` (8-voice SFX soft cap), `evtq=n/64` (event queue occupancy; full = silent post drops, M-71), `pv free/lame/alloc` (24 physical synth voices shared by SFX + music; `-1`s before sndInit), plus the D204 pipeline fields. Cheap (~30 reads/s), campaign-safe; read together with `GE_D204=1`. | **live** (D322 capture) |
 | `GE_D318W` | `port/src/d318watchdog.c:136` (`#ifdef PORT`) | **Not a probe — the D318 port-side watchdog itself, ON by default.** Detects the Facility ai_22 hold-pose softlock signature (a latent N64 race, see findings.md D318) for 600 consecutive ticks and re-seeds c78's attack via the game's own fresh-attack entry point. `GE_D318W=0` opts out; logs `D318W:` lines when it acts. **Permanent fix, not strip-candidate.** | **live** (D318 fix — permanent) |
 
 ## Notes