docs/epistemics.md summarises the review: architecture changes from 0.1
to 0.2 as a table, the resulting epistemic, security, replay and privacy
models, the tests that hold each in place, and the limitations that
remain (legacy evidence, thin calibration, rule-based interpretation,
heuristic temporal scope, reliability needing outcomes, model
nondeterminism, no cryptographic erasure, bounded chains, minimal
Bedrock, the intermittent m1 failure under load).
