fix(server): optional local auth for destructive HTTP endpoints#429
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When ENGRAM_HTTP_TOKEN is set, DELETE /sessions/{id},
DELETE /observations/{id}, DELETE /prompts/{id}, GET /export,
POST /import, and POST /projects/migrate require a matching
Authorization: Bearer <token> header. Comparison is constant-time
via hmac.Equal to prevent timing attacks. When the env var is unset
behaviour is unchanged — zero-config is fully preserved.
Closes #200
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Summary
ENGRAM_HTTP_TOKENenv var.DELETE /sessions/{id},DELETE /observations/{id},DELETE /prompts/{id},GET /export,POST /import, andPOST /projects/migraterequireAuthorization: Bearer <token>; read endpoints are never gated.hmac.Equal) prevents timing attacks; stdlib only, no new dependencies. The token is read at request time, so changes take effect without a restart.Configuration
Clients then pass
Authorization: Bearer <token>for any destructive or export/import operation.Test plan
TestOptionalAuth_NoToken,_WithToken_NoCredential,_WithToken_WrongCredential,_WithToken_CorrectCredential,_ReadEndpointsUnaffected,_TokenReadFromEnvAtRequestTimego test ./... && go vet ./... && go build ./...cleanCloses #200