docs(changelog): runner enrollment via dashboard, regrouped nav, retry idempotency

[indykish]

Changelog entry for the M84 work — runner enrollment from the dashboard, the regrouped dashboard navigation, and the Hypertext Transfer Protocol (HTTP) retry-idempotency change. Pairs with usezombie/usezombie#365.

What changed

• New Jun 04, 2026 <Update> block in changelog.mdx.
• Covers:
  • Dashboard runner enrollment via a one-time runner token (platform-admin login never touches a shell).
  • Honest derived liveness on the runner list (registered until first check-in, not a false online).
  • Left-nav regroup into Operations / Configuration / Organization, with model settings moved to their own Model entry at /settings/models.
  • Removal of zombie-runner register and its --token / --host-id flags.
  • GET /v1/fleet/runners (platform-admin only, paginated, never returns the token hash).
  • 5xx retries now gated to idempotent methods only; POST/PATCH surface failures immediately.

Notes

• Documentation-only; no code change in this repo.

Greptile Summary

This PR adds a single <Update> block to changelog.mdx documenting three M84 changes: dashboard-based runner enrollment via a one-time token, a regrouped left navigation, and a new rule limiting 5xx retries to idempotent HTTP methods.

• Runner enrollment — replaces zombie-runner register with a dashboard flow; the Upgrading section now lists all removed flags (--token, --host-id, ZOMBIE_TOKEN) and the new ZOMBIE_RUNNER_TOKEN variable; the CLI section cross-references Upgrading without duplication.
• Navigation regroup — documents the Operations / Configuration / Organization split and the new /settings/models path.
• Retry idempotency — documents that POST/PATCH failures now surface immediately rather than being retried, with network errors and 429/503/504 responses unchanged.

Confidence Score: 5/5

Documentation-only change; no runtime code is modified.

The PR adds a single changelog block. The content is accurate, internally consistent, matches the existing file conventions, and the previously flagged issues (missing --host-id in Upgrading, CLI/Upgrading duplication) are both addressed in the current version.

No files require special attention.

Important Files Changed

Filename	Overview
changelog.mdx	New Jun 04, 2026 Update block documenting runner dashboard enrollment, left-nav regroup, and HTTP retry idempotency changes; no code changes, consistent with file's existing structure and conventions.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[HTTP Request] --> B{Idempotent method?\nGET / PUT / DELETE / HEAD}
    B -- Yes --> C{Response}
    B -- No\nPOST / PATCH --> D[Surface error immediately]
    C -- 5xx server error --> E[Retry]
    C -- Network error --> E
    C -- 429 / 503 / 504 --> E
    C -- 2xx --> F[Success]
    E --> A

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