seed: initial Codecov Global YAML + plumbing

Bootstrap content for the vyos org Codecov Global YAML mirror. codecov.yml is the
comment-free dashboard-paste payload (Codecov strips comments on save); validate.yml
gates all PRs against https://codecov.io/validate. AGENTS.md + README.md document
the dashboard-paste protocol and language-applicability caveats.

Companion repo: VyOS-Networks/codecov (filed Wave 2, ~1 week soak).
Spec: [VYOS/894337074](https://vyos.atlassian.net/wiki/spaces/VYOS/pages/894337074)
Phorge: T9078
IS: IS-609

🤖 Generated by [robots](https://vyos.io)

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+# vyos/codecov
+
+Codecov Global YAML for the `vyos` GitHub organization.
+
+This repo is the canonical source for the file rendered at
+[`https://app.codecov.io/account/gh/vyos/yaml`](https://app.codecov.io/account/gh/vyos/yaml).
+The dashboard is a cache; this repo's `production` branch is the source of truth.
+
+Sibling repo: [VyOS-Networks/codecov](https://github.com/VyOS-Networks/codecov) for the
+VyOS-Networks org. Both repos hold byte-identical `codecov.yml` at design time; any future
+delta is enumerated in the per-org delta table below — never as comments in `codecov.yml`
+(Codecov strips them on dashboard save).
+
+## Change protocol
+
+1. PRs only. No direct dashboard edits.
+2. PRs run the `validate` workflow which POSTs `codecov.yml` to
+   `https://codecov.io/validate`. The check must pass.
+3. After merge to `production`:
+   ```bash
+   gh api repos/vyos/codecov/contents/codecov.yml?ref=production \
+     --jq '.content' | base64 -d
+   ```
+   Operator pastes this content into the dashboard editor (linked above), saves,
+   and re-opens the tab to confirm the saved content matches.
+
+## Paste protocol (operator)
+
+1. Open https://app.codecov.io/account/gh/vyos/yaml in browser.
+2. Fetch the merged file via `gh api ... | base64 -d` (above).
+3. Paste into the dashboard editor.
+4. Save.
+5. Re-open the dashboard tab. **Codecov strips comments** — the saved content
+   should match the paste content because the file is comment-free.
+6. Capture the Codecov change-history audit-log row (timestamp, user, prior version)
+   to the IS ticket as evidence.
+7. Record merge commit SHA + paste timestamp + audit-log reference in the IS ticket.
+
+## Per-org delta (vyos vs VyOS-Networks)
+
+(none at the time of last update — both orgs paste byte-identical `codecov.yml`)
+
+## Language-applicability caveat
+
+The numeric thresholds (`project.threshold: 1%`, `patch.target: 70%`, `patch.threshold: 5%`)
+and the `ignore` patterns (`**/*.config.{ts,js,mjs,cjs}`, `**/*.d.ts`, `.next/`, `public/`)
+are Next.js-derived from the canary in [VyOS-Networks/next-js-vyos](https://github.com/VyOS-Networks/next-js-vyos).
+They are reasonable starting points for JS/TS repos and harmless for non-JS repos (the
+`ignore` patterns simply don't match Python/C++/Ansible paths and the thresholds apply to
+whatever does upload coverage). Repos in other languages that opt into Codecov should
+override numerics in their per-repo `.codecov.yml`.
+
+## Onboarding a new repo to Codecov coverage
+
+(deferred — see spec §9 follow-up; the playbook lives in `docs/per-repo-onboarding.md` once
+the first non-canary opt-in lands)