chore(upstream): track upstream environment update changes

[incognitojam]

Adds three open upstream pull requests about environment updates to .github/upstream-tracked-prs.json. Each one conflicts with fork behavior, so its entry records what to keep when the queue reaches it.

• fix(mobile): check for server updates without GitHub's API rate limit pingdotgg/t3code#17900 moves the mobile environment update check from GitHub's API to github.com release pages. The fork already fixed the same quota failure for the mobile check and styal update with npm dist-tags (fork fix(updates): discover environment releases through npm tags #741). Keep the fork's lookup.
• feat(server): background services update themselves pingdotgg/t3code#17586 adds hourly update checks and installs when nothing is running for background services, reusing cli/update.ts release discovery. Keep the fork's resolveNewestVersion, which uses npm and confirms the release checksums are downloadable.
• feat(web): one sidebar click updates every machine and provider pingdotgg/t3code#18053 makes one sidebar action update providers, servers, and the desktop app. It is not imported early: it needs feat(auth): separate environment administration permissions pingdotgg/t3code#9786 environment maintenance scope, its sidebar changes are built on the manual download UI that fork feat(desktop): install downloaded updates on quit #358 and fix(web): show a plain restart arrow for downloaded updates #754 replaced, and its availability check queries the upstream t3 npm package. The entry lists the adaptations needed at intake.

Validation

node scripts/upstream/tracked-prs-report.ts --fork-ref HEAD lists all three entries with their current upstream state. The file passes formatting checks.

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Written by an agent (Claude Code, claude-opus-5-5).

[github-actions]

Upstream divergence

Both sides are compared with upstream at the in-order tip de34391427. Excludes .repos/ and pnpm-lock.yaml.

Measure	Base	This PR	Change
Upstream files the fork changes	1,283	1,283	0
Lines changed in them	57,337	57,337	0
Upstream files the fork removes	37	37	0
Fork-only files	373	373	0
Fork-only lines	59,546	59,558	+12

No upstream file changes how much it differs from upstream.