port(upstream#1969): remove the aggregate Avg SNR row from node views

[adminopenclaw8-sketch]

Split out of #25 (commit 224e2719 there). This branch holds exactly one upstream change so it can be reviewed, tested and reverted on its own.

Upstream

• PR: Kpa-clawbot/CoreScope#1969 by @n30nex, merged 2026-09-06
• Upstream commit: 108ea020f74a9d0a460b3e426ef0d20d0e9f0de9
• Applied with git cherry-pick -x onto master fda24ca5; upstream authorship kept, and the commit message carries the (cherry picked from commit …) line.
• Patch-id identical to the port(upstream): 26 clean upstream fixes — prune batching, /ws limits, observer liveness, watchdog race #25 commit and to the upstream commit.
• Scope: public/nodes.js, test-issue-1281-location-row-e2e.js.

Problem

The node side panel and full detail page showed an unqualified “Avg SNR” averaged across all observers. That mixes links of very different quality into one number that describes none of them.

Change

Removes the aggregate “Avg SNR” row from both views. Per-observer SNR readings under “Heard By” are unchanged.

Adaptation to this fork

None in content. The changed lines are identical to upstream; only the surrounding diff context differs because this fork's files have diverged around them.

Dependencies and merge order

• Independent. Branched directly from master fda24ca5 and needs no other PR from this split.
• A merge simulation of all 24 split PRs gives the same tree in upstream order and in reverse order.
• The same simulation also merges cleanly with each of the open API: expose on-wire channelHashHex on channel messages #11, feat(map): support CARTO basemap API keys #13 and chore(deps): bump to golang:1.27.1-alpine3.24 and alpine:3.24 #22, and with test(ingestor): make neighbor metrics pruning deterministic #33 (opened during this split; it makes TestPruneOldNeighborMetrics deterministic). If test(ingestor): make neighbor metrics pruning deterministic #33 lands first, the expected CI failure named below disappears; nothing in this PR depends on it.
• Recommended position: 19 of 24, following upstream's merge order (the order port(upstream): 26 clean upstream fixes — prune batching, /ws limits, observer liveness, watchdog race #25 was assembled in).

Verification

Local run of the same commands as CI's “Go Build & Test” job (server tests with -race), on this branch and on master fda24ca5 under the same conditions (same machine, run one after another):

Check	master fda24ca5	this branch	verdict
xss-gate-diff	PASS	PASS
channel-lib-test	PASS	PASS
decrypt-cli-build-test	PASS	PASS
dockerfile-copy-invariants	FAIL	FAIL	not runnable locally: script needs bash ≥4 (declare -A), macOS has 3.2; identical on master
staging-disk-monitor	PASS	PASS
css-vars-lint	PASS	PASS
JS unit tests from CI list + AGENTS.md set (67 files)	see below	63 PASS, 4 FAIL
test-issue-1375-scope-stats-fetch.js	FAIL	FAIL Exactly one api('/scope-stats' call exists (the fixed loader) — found 2	baseline failure, unchanged
test-issue-1648-m4-emoji-scan.js	FAIL	FAIL map.js has 1 emoji/misc-icon hit(s):	baseline failure, unchanged
test-a11y-axe-routes-coverage.js	FAIL	FAIL axe ROUTES missing analytics tabs (issue #1706): areas, foreign-traffic, wardriving	baseline failure, unchanged
test-frontend-helpers.js	FAIL	FAIL favStar returns empty star for non-favorite: The expression evaluated to a falsy value:, favStar returns filled star for favorite: The expression evaluated to a falsy value:	baseline failure, unchanged

Baseline failures (fail identically on master; not introduced or changed here): see rows marked baseline failure, unchanged.

Browser validation (local, fixture DB, no staging/production): Local Go server (built from master) on the committed E2E fixture DB (freshened, migrated and seeded exactly like CI), serving this branch's public/, compared side by side with the same server serving master's public/. Full node detail for a fixture repeater. The fixture has no SNR, so — as the upstream E2E test does with Playwright routing — /api/nodes/<pk>/health was answered in-page with stats.avgSnr: 6.3 and two observers (12.5 dB / −8.5 dB); every other endpoint was real. master: shows an "Avg SNR" row with "6.3 dB" plus the per-observer values under Heard By. this branch: no "Avg SNR" row, "Packets Today" and the other rows intact, per-observer 12.5 / −8.5 still shown under Heard By. (Side panel and mobile variants are covered by the extended E2E test, which was not run.)

Not run:

• The E2E assertions this PR adds/extends in test-issue-1281-location-row-e2e.js (Playwright) have not run anywhere for this fork.
• Playwright E2E suites (no local Playwright install); CI's E2E job will also be skipped, see below.
• eslint (not installed locally; CI installs it on the fly).
• Go -race/tests for modules this PR does not touch (unchanged code, identical to master).
• Browser tests against staging/production (deliberately none).

Expected GitHub CI: “Go Build & Test” is expected to fail on TestPruneOldNeighborMetrics, which already fails on master (see #25's run). Downstream jobs (Playwright, image build) are therefore skipped. “Deploy Staging” and all GHCR publish steps only run on push to master and cannot run for this PR.
Two further ingestor tests have failed intermittently in this split's CI on branches whose cmd/ingestor tree is byte-identical to master (#27, #28), so they can also appear here without being caused by this change:

• TestBackfillTxLastSeen_ResolvesFromMaxObservationTimestamp: also reproduced locally on unmodified master.
• TestMQTTStallWatchdog_DisconnectedEscalationThrottled_1749: the suite flake that upstream test(ingestor): join the watchdog loop goroutine instead of only asking it to stop Kpa-clawbot/CoreScope#2003 (also split out of port(upstream): 26 clean upstream fixes — prune batching, /ws limits, observer liveness, watchdog race #25) addresses.

GitHub CI result: run 34751738913 on 07d8a875. Go Build & Test: failure; all downstream jobs incl. Deploy Staging skipped. Failed tests:

• TestPruneOldNeighborMetrics: fails on master, documented baseline
• TestBackfillTxLastSeen_ResolvesFromMaxObservationTimestamp: intermittent, reproduced on unmodified master locally

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