chore(main): release 0.12.0

[Necmttn]

🤖 I have created a release beep boop

0.12.0 (2026-06-05)

Features

• canvas: auto-focus detail on deep zoom + default to focus mode (4980eca)
• canvas: inline session detail (in-place + focus), sub-row lanes, hover-prefetch (62e7422)
• canvas: progressive pill labels on zoom (a379029)
• canvas: raise time-axis zoom cap 80x -> 2000x (4511dd2)
• canvas: show detail card on hover (instant via prefetch + ~30ms summary) (72dbe7b)
• canvas: swimlanes + subagent orchestration timeline (f67a8f5)
• canvas: time-axis zoom/pan + 30x faster node query (8fe9cc9)
• dashboard: canvas size = context tokens + compaction epochs (e073f71)
• dashboard: session canvas - semantic-zoom lineage graph (33abcef)

Bug Fixes

• canvas: compaction query ts order, token M-formatting, dedupe boundaries (15eb4eb)

Performance

• canvas: DB-only session-summary for detail card (20-58s -> ~30ms) + gold bench (f2ef307)

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