docs: correct ARCHITECTURE.md against the code, link the README badges

[KristofferRisa]

Two parts: a factual audit of the docs, and the README badge update.

The docs described behaviour that does not exist

I checked each claim against the source instead of editing around it. Four were wrong:

Claim	Reality
"Reconnection: Exponential backoff (max 5 retries)" and "Heartbeat: 30-second ping interval"	Neither exists. grep -riE "reconnect|backoff|retry|ping|heartbeat" internal/ returns nothing outside tests. websocket.go has five functions and none of them reconnect.
README: "WebSocket auto-reconnects on temporary failures"	Same fiction, user-facing — and more wrong after #17, which made a parse error end the stream.
"No Pulse — Exit 2 with Pulse not enabled"	Nothing exits 2. Every error path goes through exitWithError, which is os.Exit(1).
Dependency table: nhooyr/websocket	go.mod has github.com/coder/websocket v1.8.15 — the package was renamed.

The reconnect one is the reason this is worth doing: someone reading Troubleshooting would wait for a recovery that is never coming. Both spots now say the stream ends and exits 1, and suggest a supervisor if you need it to stay up.

Also stale, less severely:

• Formatter interface was missing FormatConsumptionHistory (added in feat: implement consumption history command #12)
• Directory tree missing consumption.go, every _test.go, CONTEXT.md, .goreleaser.yml
• build-all snippet showed a PLATFORMS loop the Makefile does not have
• Testing Strategy omitted websocket_test.go
• Title said "Tibber CLI"; the project, module and binary are all powerctl

Release pipeline was undocumented

Tagging is the only way to ship, and neither ARCHITECTURE.md nor CONTRIBUTING.md said so. ARCHITECTURE.md gains a Release Pipeline section; CONTRIBUTING.md gains a Releasing section with the tag commands, the dry-run that renders notes without publishing, and how the changelog grouping behaves.

Badges

They were bare <img> tags that linked nowhere. Now:

• release → links to /releases/latest
• release notes → new, links to /releases
• tests → pinned to ?branch=main, links to the workflow
• license → links to LICENSE

All four verified to return 200 with live values (release: v0.4.2, release notes: today, tests: passing, license: MIT) rather than assumed.

Verification

• make check passes
• Every relative link across README, CONTRIBUTING, ARCHITECTURE and CLAUDE.md resolves to a file that exists
• User-Agent: powerctl-cli/1.0 claim confirmed against websocket.go:18 before documenting it

No code changes.

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