chore(main): release flagd-core 2.0.0

[github-actions]

🤖 I have created a release beep boop

2.0.0 (2026-01-27)

⚠ BREAKING CHANGES

• improve eval performance, restructure lib, support flag metadata (#1120)
• allow overrides for fractional seed (#870)

🐛 Bug Fixes

• flagd-core: use injected logger (#1057) (4e21b83)
• flagd: improve targeting key check in fractional operator (#1048) (7d82649)
• grpc not retrying UNAVAILABLE/UNKNOWN, e2e test stability (#1457) (7213189)
• security: update vulnerability-updates (#1342) (fca83c9)
• update json logic engine and schema (#914) (04f0dfd)

✨ New Features

• Add FLAGD_STREAM_DEADLINE_MS parameter (#1430) (be6f2f9)
• Add FLAGD_SYNC_PORT support for in-process providers with backwards compatibility (#1413) (8feffee)
• add targeting validation/warning (#878) (2a4dbcf)
• allow overrides for fractional seed (#870) (6c376b2)
• Change fractional custom op from percentage-based to relative weighting. #946 (#954) (0e9bc84)
• flagd-core: add bulk evaluation method (#1010) (52aebed)
• flagd: add flag metadata (#1151) (b1c6d23)
• Implement retryGracePeriod param (#1289) (#1445) (d8104fa)
• improve eval performance, restructure lib, support flag metadata (#1120) (f1ed82a)
• support no default variant (#1354) (f2efa55)

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