feat(github): add devnet test release tracker issue template

.github/ISSUE_TEMPLATE/devnet-tracker.md

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+---
+name: Devnet Test Release Tracker
+about: Track EL test release readiness for a devnet (tests-<feat>-devnet@vX.Y.Z)
+title: '<feat>-devnet@vX.Y.Z Test Release Tracker'
+labels: C-tracker, P-high
+assignees: ''
+
+---
+
+## `<feat>`-devnet@v`X.Y.Z`
+
+> [!NOTE]
+> This is an **execution layer (EL) only** tracker — it does not cover
+> consensus layer (CL) readiness.
+
+### Overview
+
+<!--
+    Briefly describe the purpose of this devnet test release, its scope, and any
+    relevant links (devnet specs repo, ACD notes, configuration / genesis).
+
+    The `<feat>` keyword is typically the fork name or headliner feature
+    (e.g. `bal`, `glamsterdam`). The release fills all forks until the
+    development fork (e.g. `fill --until Amsterdam`) so clients can guard
+    against regressions, and is run in Hive CI under the standard naming scheme.
+-->
+
+- **Target release tag**: <!-- e.g. tests-glamsterdam-devnet@v5.0.0 -->
+- **EELS branch**: <!-- link to the `feat-devnet-N` branch being used for this devnet -->
+- **Test release date**: <!-- YYYY-MM-DD or "TBD" — aim for 5 days before the devnet -->
+- **Devnet launch date**: <!-- YYYY-MM-DD or "TBD" -->
+
+> [!NOTE]
+> **Versioning** (`vX.Y.Z`): `X` is the devnet number (e.g. `5` for
+> `glamsterdam-devnet-5`), making the targeted devnet explicit. `Y`/`Z` follow
+> the same semantics as the consensus test releases: `Y` (minor) is bumped for
+> a change in behaviour (a spec/test change that alters existing fixtures), and
+> `Z` (patch) is bumped for new test additions only.
+
+> [!NOTE]
+> Aim to cut the test (fixture) release **at least 5 days before** the devnet
+> launch, to give client teams time to integrate and run them.
+
+### Follows On From _(optional)_
+
+<!--
+    Optional. If there is a previous devnet release tracker, link it here for
+    context — even if the scope has changed. If this is a test-only follow-up
+    (most updates are test additions and the scope is semantically unchanged),
+    keep this issue small and list only what is new below. If there is no
+    predecessor (a brand new `<feat>` / first devnet), remove this section.
+-->
+
+This is a follow-up to the `tests-<feat>-devnet@vX.Y.Z` tracker (#`<issue>`),
+with test additions only.
+
+> [!TIP]
+> For a test-only follow-up, the sections below can be trimmed to just what
+> changed since the previous tracker.
+
+### Aim
+
+<!--
+    A short statement of what we're aiming for in this devnet test release.
+    Be explicit that the scope is tentative and will change.
+-->
+
+We aim to include the following EIPs in the first `<feat>-devnet-N` EELS test
+release (`tests-<feat>-devnet@vX.Y.Z`). This scope is tentative — EIPs may be
+added, dropped, or deferred as decisions land in ACD and during implementation.
+
+### Instructions
+
+- [ ] Add the issue to the target fork milestone if applicable.
+- [ ] Link each included EIP's [EIP Implementation Tracker](https://github.com/ethereum/execution-specs/issues/new?template=eip-tracker.md) below.
+
+> [!IMPORTANT]
+> Per-EIP specification and testing progress is tracked in the individual EIP
+> Implementation Tracker issues. This issue tracks devnet-level readiness only.
+
+### Proposed Scope
+
+<!--
+    Group EIPs by confidence. Move EIPs between groups as decisions are made,
+    and check an EIP off in "Confirmed" once its tracker issue is stable.
+
+    Always pin the exact spec version each devnet targets — `eips.ethereum.org`
+    renders the latest EIP, but a devnet freezes a specific version, and that
+    skew is a common source of cross-client divergence. Pin via a commit
+    permalink to the EIP markdown (github.com/ethereum/EIPs/blob/<sha>/EIPS/eip-<n>.md)
+    and/or the open EIP PR(s) — a SHA and PR(s) ideally, but either works.
+    Devnets routinely run ahead of the merged EIP, and a single EIP may have
+    several relevant PRs — list them all.
+-->
+
+#### Confirmed
+
+- [ ] [EIP-<eip-number>](https://eips.ethereum.org/EIPS/eip-<eip-number>) ([ethereum/EIPs#<pr>](https://github.com/ethereum/EIPs/pull/<pr>), [#<pr>](https://github.com/ethereum/EIPs/pull/<pr>)) — #<tracker-issue>
+- [ ] [EIP-<eip-number>](https://eips.ethereum.org/EIPS/eip-<eip-number>) ([ethereum/EIPs#<pr>](https://github.com/ethereum/EIPs/pull/<pr>)) — #<tracker-issue>
+
+#### To Be Discussed
+
+<!-- Items pending an ACD / owner decision. Link the relevant EIP PR(s). -->
+
+- [ ] [EIP-<eip-number>](https://eips.ethereum.org/EIPS/eip-<eip-number>) ([ethereum/EIPs#<pr>](https://github.com/ethereum/EIPs/pull/<pr>)) — <reason / link to discussion PR>
+
+#### At Risk / Likely Dropped
+
+<!-- EIPs that may not make this devnet. -->
+
+- [ ] [EIP-<eip-number>](https://eips.ethereum.org/EIPS/eip-<eip-number>) ([ethereum/EIPs#<pr>](https://github.com/ethereum/EIPs/pull/<pr>)) — <reason>
+
+### Notes & Risks
+
+<!--
+    Call out the integration challenges and known hard spots, e.g. cross-EIP
+    alignment, ordering dependencies, framework changes.
+-->
+
+The most difficult changes are expected to be `<...>`. Highlight any cross-EIP
+alignment, ordering dependencies, or testing-framework work that could block the
+release here.
+
+### Specification + Testing Status
+
+- [ ] All included EIP specifications merged to the corresponding `feat-devnet-N` branch.
+- [ ] Devnet branch (`feat-devnet-N`) created and rebased on the target `forks/<fork>` branch.
+- [ ] Required testing framework modifications implemented.
+- [ ] Sufficient test suites for the included EIPs implemented.
+- [ ] No regressions or failures in tests from prior forks (including static tests).
+- [ ] Fixtures generated and released for the devnet.
+- [ ] [`hive-tests`](https://github.com/ethpandaops/hive-tests/tree/master/.github/workflows) repo checked/updated to run the latest set of fixtures.
+- [ ] [`hive-ui`](https://github.com/ethpandaops/hive-ui/blob/master/public/discovery.json) discovery checked/updated to the latest devnet workflow file within the `hive-tests` repo.
+
+### Process Status
+
+- [ ] Hive tests passing on at least two implementations.
+- [ ] Interop / cross-client testing completed.
+- [ ] Devnet launched.
+- [ ] Post-launch issues triaged and tracked.
+
+### Closure
+
+<!--
+    Before closing this issue, link the test fixture release tag that shipped
+    for this devnet.
+-->
+
+- [ ] Linked the test fixture release tag used for this devnet: <!-- e.g. https://github.com/ethereum/execution-specs/releases/tag/<tag> -->
+
+> [!IMPORTANT]
+> After tagging, any future changes must be added to a newly created devnet
+> tracker rather than reopening or amending this one.