docs(changelog): record the eight PRs already merged into 3.8.55

[LMPrado-DZ23]

The [3.8.55] section stopped at #47 while eight more PRs landed. Writing the release note at tag time, from memory, is how shipped work goes unrecorded — so this catches the section up while the PRs are still fresh, and leaves tagging with nothing to reconstruct.

PR	Recorded as
#48	Maintenance — governance debt 150 → 53 untested routes, 388 tests, each batch verified failable
#50	Feature — Add API Key links to the page that issues the key
#51	Fix — phantom operations at zero; the policy CLI stops overclaiming
#52	Feature — workspace → project → API key hierarchy with rolled-up budgets
#55	Fix — dark theme meets AA without repainting the brand
#57	Feature — 11 more CLIs pointable at the gateway (catalog 36 → 47)
#58	Fix — the key URL moved to the field the product actually reads
#59	Fix — the new-code gates run on Windows again

Each bullet says what was wrong and what changed, not just the subject line — for #55 and #58 in particular, the defect is the interesting part: one was invisible to the gate because the axe suite only measured the light theme, the other was a curated URL sitting in a field nothing reads.

Mirrored into the 41 localized changelogs with scripts/release/sync-changelog-i18n.mjs (41 files written).

Gate	Result
check:changelog-integrity	OK — no base bullets lost
check:doc-links	PASS — 172 docs, 1044 internal links
prettier --check CHANGELOG.md	clean

The [3.8.55] heading stays TBD; the date is set at tag time.

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