v0.4.0

What's Changed

• feat(index): add durable journal substrate by @3leapsdave in #129
• feat(index): add durable compactor core by @3leapsdave in #130
• feat(index): add durable segment manifest writer by @3leapsdave in #131
• feat(index): add durable snapshot publication gate by @3leapsdave in #132
• feat(indexbuild): add durable index build engine by @3leapsdave in #133
• feat(index): add boundary render guard by @3leapsdave in #134
• feat(index): add manifest reachability contract by @3leapsdave in #135
• feat(index): add GON-055 Slice A dual-format parity by @3leapsdave in #136
• feat(index): add durable snapshot delta comparator by @3leapsdave in #137
• feat(index): add durable hub export hydrate by @3leapsdave in #138
• feat(index): describe compare result semantics by @3leapsdave in #139
• feat(index): surface hub run formats by @3leapsdave in #140
• fix(index): harden hub latest pointer reads by @3leapsdave in #141
• feat(index): make durable the default index build format by @3leapsdave in #142
• feat(index): allow build.scope under durable and both formats by @3leapsdave in #143
• feat(index): emit durable build progress on stderr by @3leapsdave in #144
• docs(release): prepare v0.4.0 durable index default package by @3leapsdave in #145

Full Changelog: v0.3.7...v0.4.0