chore(main): release 0.4.0

[github-actions]

🤖 I have created a release beep boop

0.4.0 (2026-03-03)

Features

• ha: add HA foundation with SRG state machine, gRPC peer, and component integration (#137) (2df141b)
• ha: add interface tracking, SRG counters handler, and split-brain resolution (#141) (d6f5c5e)
• ha: add pool-targeted sync and full bulk sync from live sessions (#165) (573e145)
• ha: add session sync for HA standby replication (#164) (0b2bf44)
• ha: add SRG BGP route advertisement and withdrawal on failover (#142) (1e3613f)
• ha: add SRG dataplane abstraction with VPP implementation and no-op fallback (#140) (89888e5)

Bug Fixes

• ha: standby does not auto-promote on peer loss (#163) (0693571)
• ipv6: use separate IPv6 profile name in allocator and add PPPoE IANA allocation (#159) (34a6dca)
• poll for bngblaster exit instead of fixed sleep (#157) (76d613d)
• poll for IPv6 readiness in session tests and enable IP6CP for PPPoE (#158) (9bd142d)

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