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feat: add beliefs with evidence-derived confidence, contradictions and corrections

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Phase 6. Beliefs are propositions with a prior set by epistemic kind and a
confidence computed from typed evidence: sigmoid(logit(prior) + slope ×
(support × diversity − opposition)), where support from a single source
is discounted so repetition cannot manufacture certainty, and bounds keep
the mind away from absolute certainty. Every evaluation stores its
breakdown and appends a version row protected by the append-only
trigger; the belief page shows the arithmetic, evidence for and against,
alternatives, contradictions and history.

Contradiction detection is deterministic first (negation plus token
overlap): a hit emits contradiction_detected, links both beliefs and
makes each counter-evidence for the other so both trend to contested.
Operators can assert beliefs (their statement is the evidence), add
evidence, mark a belief wrong (pinned rejected, history kept) and forbid
an inference; do-not-infer corrections block matching hypotheses.
Retracting a memory retracts the evidence that cited it and re-evaluates
the beliefs concerned.

The associate process proposes low-confidence causal hypotheses from
co-occurring notable observations, and the hypothesis handler turns
admitted ones into beliefs with automatic alternatives, closing demo
scenarios 1 and 2 without any model call.
This commit is contained in:
Andy Dixon
2026-06-21 22:14:12 +01:00
parent 03631e5685
commit 73e5753a91
29 changed files with 2344 additions and 20 deletions
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internal/api/api_test.go
+2 -1
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@@ -13,6 +13,7 @@ import (
"github.com/andydixon/noema/internal/app"
"github.com/andydixon/noema/internal/audit"
"github.com/andydixon/noema/internal/auth"
"github.com/andydixon/noema/internal/beliefs"
"github.com/andydixon/noema/internal/brain"
"github.com/andydixon/noema/internal/config"
evstore "github.com/andydixon/noema/internal/events"
@@ -31,7 +32,7 @@ func testServer(t *testing.T) (*httptest.Server, string) {
cfg.DatabaseURL = "postgres://test"
log := slog.New(slog.DiscardHandler)
deps := app.Deps{Config: cfg, Log: log, DB: pool, Auth: auth.NewService(pool, time.Hour, 2*time.Hour),
Audit: audit.New(pool, log), Metrics: observability.NewMetrics(), Minds: minds.NewStore(pool), Memory: memory.NewStore(context.Background(), pool, nil), Events: evstore.NewStore(pool, evstore.NewBus(50), nil), Migrations: migrations.FS, Started: time.Now()}
Audit: audit.New(pool, log), Metrics: observability.NewMetrics(), Minds: minds.NewStore(pool), Beliefs: beliefs.NewStore(pool), Memory: memory.NewStore(context.Background(), pool, nil), Events: evstore.NewStore(pool, evstore.NewBus(50), nil), Migrations: migrations.FS, Started: time.Now()}
ctx := context.Background()
group := scheduler.NewGroup(ctx, log)
t.Cleanup(func() { group.Stop() })