Document fleet changes in Unreleased changelog

[Finesssee]

Summary

Document the merged 38-PR porting fleet (upstream 0.60.4 → 0.62.0 lane) in a new top-level ## Unreleased changelog section, above the [Windows] 0.61.0 - Unreleased section from #571.

• Adds ### Added, ### Changed, and ### Fixed entries grouped by theme (providers, Usage & Spend, cost, accounts, tray, serve), each with (#NNN) links following the existing section conventions.
• Does not touch [Windows] 0.61.0 - Unreleased — that content was already reconciled by Reconcile Win-CodexBar 0.61.0 release notes #571 and remains unchanged.
• No version bump: version.env untouched, no release section implied beyond Unreleased, no tag.

Exact changed-file set: CHANGELOG.md only (31 insertions).

Validation

• git diff origin/main --stat → CHANGELOG.md | 31 +++++++++++++++++++++++++++++++ (CHANGELOG.md only)
• Duplicate (#NNN) link check across the whole file — no duplicate PR links inside the new section (pre-existing Port upstream 0.60.2 Claude-swap account behavior #503/Port upstream CodexBar v0.60.3 #505 duplicates in older sections are from earlier releases and left untouched).
• Existing sections verified byte-identical to origin/main.

Coverage notes

• 0.61.0 lane content (Port DeepSeek per-model spend from upstream 0.61.0 #556–Port Replicate billing provider #570, Reconcile Win-CodexBar 0.61.0 release notes #571–[0.61.0] Expose Antigravity terminal strategy outcomes #574 except [0.60.4] Keep Claude account labels private #555/Reconcile Win-CodexBar 0.61.0 release notes #571 doc-only) is intentionally NOT duplicated here: Reconcile Win-CodexBar 0.61.0 release notes #571 already reconciled the [Windows] 0.61.0 section for those.
• Pre-fleet PRs (Port v0.60.4 OpenRouter credits fallback #514–fix: prevent unsupported Codex Web source mode #541) and 0.60.4/0.60.5/0.62.0 lane PRs not already covered (Port v0.60.4 Amp Tier usage and pacing #515, fix(azureopenai): raise reasoning-model probe budget #525, fix(antigravity): fall back to structured CLI usage #526, feat(serve): add maintainable Prometheus metrics endpoint #528, Fix Qwen weekly-only usage label #534, Use token expiry for Codex OAuth validation #535, Fix Claude transient OAuth state handling #537, Harden Grok multi-account persistence and usage UI #538, Harden Codex pending scan lineage and structure #539, fix: prevent unsupported Codex Web source mode #541–[0.60.4] Preserve workspace cache scope and lean reports #552, [0.60.5] Preserve SSH username case in remote sessions #554, [0.60.4] Keep Claude account labels private #555, Stop account switches from duplicating managed homes #563, Add transient provider detail carrier #564, [0.62.0] Emit usage updated hooks #575, [0.62.0] Recover cached Codex pricing from source #576–[0.62.0] Add provider usage item visibility #581) are documented in the new Unreleased section.

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[Finesssee]

Thermo-nuclear code-quality review

Verdict: FINDINGS. Reviewed head 1694651ae. The branch is behind main.

P2: This creates a second "Unreleased" release block instead of extending the existing one

CHANGELOG.md already opens with ## [Windows] 0.61.0 - Unreleased. This PR puts a new ## Unreleased above it, so the file now has two unreleased sections. A reader can't tell which release ships which change, and the release step has to reconcile both by hand. Fold these entries into the canonical unreleased section, or rename that section if these changes belong to a later version. Either way the file should keep one unreleased block, in the existing [Windows] x.y.z format.

P2: Entries duplicate what is already on main

• The Hide Personal Info Account N fix ([0.60.4] Keep Claude account labels private #555) already appears under 0.61.0 → Fixed on main, word for word.
• The first Added bullet repeats CodeRabbit, Muse Code and Nous Portal, which the 0.61.0 summary already lists.

When two sections describe the same change, one of them goes stale. Each change should be recorded once.

P2: The list is stale against current main

The branch predates #588 (0.63.0 dashboard spend) and #604 (0.64.0 provider adapters), and neither is listed. The fleet PRs still in flight (#596–#605, integrated through #610) will also land after this. Regenerate the list from main at merge time. If it's written this far ahead, it will be wrong again by the time it lands.

P3: Keep internal plumbing out of user-facing notes

"transient provider detail carrier", "transient provider inventory plumbing" and "Prometheus metrics endpoint with maintainable module structure" describe implementation, not behavior. Rewrite them as what the user sees, or drop them.