qa(plan): apply v3.6.0-rc QA findings (#832/#833/#836) (#837)

Apply v3.6.0-rc QA learnings to the plan.

## Changes
- **§1.1** — 1 GB cap is unrealistic on real DBs without `GOMEMLIMIT` +
bounded cold-load. Raised target to 3 GB and pointed to follow-up
**#836**. (Investigation showed cold-load transient blows past any
sub-2GB cap regardless of `maxMemoryMB` setting because
`runtime.MemStats.NextGC` ignores cgroup ceilings.)
- **§1.4** — `trackedBytes`/`trackedMB` is in-store packet bytes only
and under-reports RSS by ~3–5× (no indexes, caches, runtime overhead,
cgo). Switched the assertion to use `processRSSMB` exposed by **#832**
(PR **#835**).
- **§11.1** — noted the Playwright deep-link E2E assertion was updated
by **#833** (PR **#834**) to match the post-#823 full-screen behavior.

## Why
Three real findings from the QA ops sweep ([§1.4 fail
comment](https://github.com/Kpa-clawbot/CoreScope/issues/809#issuecomment-4286113141)).
Updating the plan so the next run doesn't replay the same
false-fail/false-pass conditions.

Co-authored-by: Kpa-clawbot <agent@corescope.local>

qa/plans/v3.6.0-rc.md

@@ -16,7 +16,7 @@ Record every fixture used in the final report so failures are reproducible.
 ### 1. Memory & Load
 | # | Step | Pass criteria | Source | Mode |
 |---|---|---|---|---|
-| 1.1 | Container with 1 GB limit starts on heaviest available DB | No OOM, steady state under limit | #806 | human |
+| 1.1 | Container with **3 GB** limit starts on heaviest available DB | No OOM, steady state under limit. Note: 1 GB cap is unrealistic without `GOMEMLIMIT` and bounded cold-load — see #836 | #806/#836 | human |
 | 1.2 | Hit `/debug/pprof/heap` after Load completes; run `pprof-snapshot.sh` | `unmarshalResolvedPath` absent from top-15 inuse_space; `Load()`-attributed inuse_space ≤ 250 MB on staging-sized DB (~1.5M obs); total heap < 1 GB | #806 | auto: pprof-snapshot.sh |
 | 1.3 | Set tight `MaxLoadMemMB`, restart | Load stops gracefully at budget; server still serves `/api/stats` 200 | #790 | human |
 | 1.4 | Watch `processRSSMB` (from `/api/stats`) vs procfs RSS over ingest+eviction cycles | `processRSSMB` tracks `cat /proc/$(pidof corescope)/status | awk '/VmRSS/{print $2}'` (kB → MB) within ±20% across one full eviction cycle. Note: `storeDataMB` (formerly `trackedMB`) is the in-store packet byte estimate and is expected to be a **subset** of RSS, not equal to it. | #751, #832 | human |
@@ -99,7 +99,7 @@ Run `scripts/api-contract-diff.sh BASELINE_URL TARGET_URL` once. Report the scri
 ### 11. Deploy/ops
 | # | Step | Pass criteria | Source | Mode |
 |---|---|---|---|---|
-| 11.1 | Force-redeploy staging | Container removed cleanly even if `docker run`, not compose | fa348ef | human |
+| 11.1 | Force-redeploy staging | Container removed cleanly even if `docker run`, not compose. Playwright E2E `Desktop: deep link #/nodes/{pubkey} opens full-screen detail view` passes (updated #833 — was asserting old pre-#823 split-panel behavior). | fa348ef/#833 | human |
 
 ## GO criteria
 - Sections 1.2, 2, 3 must all pass — release blockers