A polish-and-fixes pass on 2.0: Witness Mode reworked, several long-dormant strategic systems brought back to life, audio tuned, and a long tail of fixes.

Witness Mode, reworked

Now a toggle you flip before any run on the New Lineage screen and the World Builder instead of a separate title entry. Once a run is witnessed, it stays witnessed.
On-screen speed controls (slower · pace · faster) and pause, sized for both desktop and touch.
The witnessed heir's portrait now leads their card, and the on-screen overlay was de-cluttered.
Systems that now do what they say

Era Troths. Several late-game troths (Iron Constitution, The Winnowing, Apotheosis Hunger, the inheritance troths) were declared but inert — they now genuinely shift heir mortality, newborn survival, and inheritance.
Founding Oath. The World Builder oath (Long Memory / Claim / Mercy / Secrecy) is no longer flavor — each gives the bloodline a small, lasting edge.
Living rivals & nemesis. Rival successions and fallen houses now surface in the chronicle, the nemesis grudge-inheritance beat fires across generations, and older saves are granted a sworn rival on load.
Audio

Supplied soundtrack pulled back to procedural music for now (album switching wasn't solid).
The new "numb" SFX palette is the default — fuller, weightier interface and event sound.
Chronicle

The Soul Teller now cites your World Builder authorship: the world and house you named, the oath you swore, the founder you built, and the rival houses (and their founding heads) you raised against yourself.
Fixes

Founder customizer: Reroll Banner / Physical now work every time (not just once).
New-game screen layout cleaned up (Witness toggle no longer overlaps).
Stat-check results no longer print raw decimals.
Fixed a phantom highlight / dead click-spot on the first hub of a witnessed run.
Quieted button hover-sound spam; macOS fullscreen crash fixed.
Plus a long tail of smaller correctness fixes from a multi-round bug hunt.